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Mjölnir's Strike

From Fire Emblem Wiki, your source on Fire Emblem information. By fans, for fans.

Mjölnir's Strike is a game mode in Fire Emblem Heroes, introduced in the update that launched the game's Book IV era. It is a multi-phase game mode where players first attempt to defend their own keeps against invading armies, then takes the offensive the following day in order to take out the army's commander.

The gameplay

Cycles of Mjölnir's Strike make usage of either three or four phases in sequence: Brace, Shield, Counter, and Rest. Not every cycle uses the Rest phase.

Brace and Rest

There is no active fighting during these two phases; the only activity players may undertake during this phase is editing their defensive keep, which is an action available at any time. Brace phases occur when the next enemy army commander is known, while Rest phases occur when the next enemy army commander is unknown. Enemy army commanders become known when their cycles are added to the game in each given update; updates where more than one cycle is added to the game will skip the Rest phase at the end of the Counter phase and move straight into the next Brace phase between such events, as will updates to the game made while a cycle is currently on a Shield or Counter phase.

Brace and Rest phases collectively have no set duration; their collective duration depends on the length between the end of the previous Counter phase and the next Shield phase.


In this phase, players choose from one of three difficulties: Beginner, Intermediate, Advanced. These difficulties work similar as to the equivalent difficulties of various modes of the Coliseum as far as enemy strength and player scoring are concerned. During this phase, players work to defend their keep from waves of invading enemy units, with reinforcements, with the aim of preventing the enemies from destroying both of their Gateways for seven turns.

Enemy units adapt to the player's teams in the same fashion as in an Allegiance Battle of like difficulty. During situations where players test their Shield Maps, all enemies are generics; in an actual Shield phase battle, enemy characters are generally drawn from the stated source game of the army commander, with situations presumably allowing for either generics or Heroes originals to take the field if necessary, also in a similar fashion to an Allegiance Battle. As a number of team-composition mechanics from Allegiance Battle are in usage, it is presumed that Shadow Dragon and the Blade of Light, Mystery of the Emblem, and New Mystery of the Emblem are treated as the same game for purposes of enemy team composition (as would Shadow Dragon in the event any character gets credited to that game; a similar situation would likewise exist between Gaiden and Echoes: Shadows of Valentia in the event any character were to get credited to the former).

Should both of a player's Gateways be destroyed, the player loses the battle. At the end of a battle, a player is given their score in a similar fashion as the Coliseum modes; players are scored based on the chosen difficulty, the composition of their team, having the bonus structure present, and having a Mythic Hero of the correct element in play, with a reduction should one of the two Gateways not survive the battle. Mythic Hero bonuses work in pairs of elements, Light/Dark and Astra/Anima, with each element pair being able to assume either order within them for a total of four combinations; one element gives a major bonus, while the other of the pair gives a minor bonus.

The Shield phase has a duration of 24 hours, following a Brace phase and preceding a Counter phase.

Shield Map

Players construct their Shield Maps in the same fashion as their Aether Keeps in Aether Raids, with the ability to place both characters and structures. Players may place four pairs of characters and four structures other than their Gateways on their maps, and move these elements around freely within their designated areas. Structures, including Gateways, and three of the four character pairs are on the bottom six rows, while one character pair is on the top two rows.

Characters fight on Shield Maps paired up by default. Players build four of these pairs for their Shield Maps, and these pairs are given special properties: the pair placed in the top two rows cannot be attacked by enemy units, and each of the three pairs placed in the bottom six rows are given +10 boosts to one of Speed, Defense, and Resistance, with one pair assigned each of those three stats.


In this phase, players take to the offensive by making usage of Counter Arrows. Each player is spotted three Counter Arrows per Counter phase, and may elect to fire these arrows at any time during the phase. The amount of damage a player does in a single strike depends on their tier, their score from the Shield phase, how many of their Counter Arrows fired at once, and whether the heroic side's current score is higher or lower than the opposing side's current score, with the displayed scores being updated hourly.

Should the heroic side win the Counter phase, the mode's Askr level will increase by at least one, possibly by two depending on how many hours they held the advantage. Should the opposing side win the Counter phase, the mode's Askr level will decrease by one regardless of how many hours a side held the advantage.

At the end of the phase, each participating player is rewarded based on their overall performance between the Shield and Counter phases, as well as the game's Askr level.

The Counter phase has a duration of 21 hours, following a Shield phase and preceding a Rest or Brace phase.


These structures can be crafted and upgraded to be used on Shield Maps.

List of Defensive structures
Image Structure Cost Description
64px Askran Seal Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Grants Atk/Spd/Def/Res+6 to allies within 5 rows and 5 columns centered on structure.
64px Death's Throne Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Prevents counterattacks from any foe within 9 rows and 3 columns centered on structure with HP ≤ 55 through that foe's next action.
64px Deluge Fountain Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Pushes any foe within 9 rows and 3 columns centered on structure with HP ≤ 55 back by 2 spaces, toward the top of the map.
64px Dökkálfar Briar Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Restricts movement to 1 space on any foe in the same column as structure with HP ≤ 55 through that foe's next action.
64px Emblian Seal Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Inflicts Atk/Spd/Def/Res-6 on foes within 9 rows and 3 columns centered on structure through their next actions.
64px Heroic Banner Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Grants bonus to Atk/Spd/Def/Res during combat = current bonus on each of ally's stats to allies within 5 rows and 5 columns centered on structure. Calculates each stat bonus independently. (That turn only.)
64px Life's Jewel Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Restores 40 HP to allies within 5 rows and 5 columns centered on structure.
64px Ljósálfar Garden Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Allies within 5 rows and 5 columns centered on structure can move 1 extra space. (That turn only. Does not stack.)
64px Múspell Pyre Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Deals 40 damage to foes within 9 rows and 3 columns centered on structure.
64px Nifl Icicle Is feh midgard gem.png 100
Is feh midgard gem.png 300
Is feh midgard gem.png 500
Grants Special cooldown count-3 to allies within 5 rows and 5 columns centered on structure.

Reward tables

Tier rewards

Score rewards
Tier Divine Code: Part 1 Midgard Gem Dragonflowers*
21 100 150 50
20 80 145 40
19 76 140 38
18 72 135 36
17 68 130 34
16 64 125 32
15 60 120 30
14 56 115 28
13 52 110 26
12 48 105 24
11 44 100 22
10 40 95 20
9 36 90 18
8 32 85 16
7 28 80 14
6 24 75 12
5 20 70 10
4 16 65 8
3 12 60 6
2 8 55 4
1 4 50 2

Askr Lv. rewards

Rank rewards
Askr Lv. Hero Feathers
25 2,500
24 2,400
23 2,300
22 2,200
21 2,100
20 2,000
19 1,900
18 1,800
17 1,700
16 1,600
15 1,500
14 1,400
13 1,300
12 1,200
11 1,100
10 1,000
9 900
8 800
7 700
6 600
5 500
4 400
3 300
2 200
1 100

List of Mjölnir's Strike themes

Note: The first date listed denotes the beginning of the Strike phase, beginning at 7:00 AM UTC the listed day and ending at 6:59 AM on the following day; the second date listed denotes the ending of the Counter phase, beginning at 7:00 AM UTC the previous day and ending at 3:59 AM UTC on the listed day.
List of Mjölnir's Strike themes
Dates Notes
Event 1 Portrait narcian feh.png
Narcian: Wyvern General
December 9, 2019-December 11, 2019 --
Event 2 Portrait robin f feh.png
Robin: Mystery Tactician
December 18, 2019-December 20, 2019 --
Event 3 Portrait ursula feh.png
Ursula: Blue Crow
December 27, 2019-December 29, 2019 --
Event 4 Portrait michalis feh.png
Michalis: Ambitious King
January 6, 2020-January 8, 2020 --
Event 5 Portrait navarre feh.png
Navarre: Scarlet Sword
January 10, 2020-January 12, 2020 --
Event 6 Portrait zephiel feh.png
Zephiel: The Liberator
January 22, 2020-January 24, 2020 --
Event 7 Portrait xander feh.png
Xander: Paragon Knight
January 26, 2020-January 28, 2020 --
Event 8 Portrait lloyd feh.png
Lloyd: White Wolf
February 3, 2020-February 5, 2020 --
Event 9 Portrait camus feh.png
Camus: Sable Knight
February 12, 2020-February 14, 2020 --
Event 10 Portrait legion feh.png
Legion: Masked Maniac
February 19, 2020-February 21, 2020 --
Event 11 Portrait clarisse feh.png
Clarisse: Sniper in the Dark
February 26, 2020-February 28, 2020 --
Event 12 Portrait berkut feh.png
Berkut: Prideful Prince
March 3, 2020-March 5, 2020 --
Event 13 Portrait valter feh.png
Valter: Dark Moonstone
March 24, 2020-March 26, 2020 --
Event 14 Portrait arvis feh.png
Arvis: Emperor of Flame
March 28, 2020-March 30, 2020 --
Event 15 Portrait oliver feh.png
Oliver: Admirer of Beauty
April 10, 2020-April 12, 2020 --
Event 16 Portrait lyon feh.png
Lyon: Shadow Prince
April 16, 2020-April 18, 2020 --
Event 17 Portrait takumi empty vessel feh.png
Takumi: Empty Vessel
April 28, 2020-April 30, 2020 --
Event 18 Portrait saias feh.png
Saias: Bishop of Flame
May 5, 2020-May 7, 2020 --
Event 19 Portrait kana m feh.png
Kana: Dragon Spawn
May 10, 2020-May 12, 2020 --
Event 20 Portrait julius feh.png
Julius: Scion of Darkness
May 14, 2020-May 16, 2020 --
Event 21 Portrait linus feh.png
Linus: Mad Dog
May 18, 2020-May 20, 2020 --
Event 22 Portrait walhart feh.png
Walhart: The Conqueror
June 2, 2020-June 4, 2020 --
Event 23 Portrait jamke feh.png
Jamke: Prince of Verdane
June 8, 2020-June 10, 2020 --
Event 24 Portrait garon feh.png
Garon: King of Nohr
June 17, 2020-June 19, 2020 --
Event 25 Portrait aversa feh.png
Aversa: Dark One
June 22, 2020-June 24, 2020 --
Event 26 Portrait gharnef feh.png
Gharnef: Dark Pontifex
July 6, 2020-July 8, 2020 --
Event 27 Portrait naesala feh.png
Naesala: Sky's Shadow
July 14, 2020-July 16, 2020 --
Event 28 Portrait panne proud taguel feh.png
Panne: Proud Taguel
July 18, 2020-July 20, 2020 --
Event 29 Portrait rutger lone swordsman feh.png
Rutger: Lone Swordsman
July 22, 2020-July 24, 2020 --
Event 30 Portrait haar black tempest feh.png
Haar: Black Tempest
August 5, 2020-August 7, 2020 --
Event 31 Portrait delthea tatarrah's puppet feh.png
Delthea: Tatarrah's Puppet
August 12, 2020-August 14, 2020 --
Event 32 Portrait cynthia hero chaser feh.png
Cynthia: Hero Chaser
August 21, 2020-August 23, 2020 --
Event 33 Portrait kronya gleaming blade feh.png
Kronya: Gleaming Blade
August 29, 2020-August 31, 2020 --
Event 34 Portrait death knight the reaper feh.png
Death Knight: The Reaper
September 4, 2020-September 6, 2020 --
Event 35 Portrait astram midia's hero feh.png
Astram: Midia's Hero
September 16, 2020-September 18, 2020 --
Event 36 Portrait conrad masked knight feh.png
Conrad: Masked Knight
September 23, 2020-September 25, 2020 --
Event 37 Portrait cormag aloof lanceman feh.png
Cormag: Aloof Lanceman
September 28, 2020-September 30, 2020 --
Event 38 Portrait kempf conniving general feh.png
Kempf: Conniving General
October 5, 2020-October 7, 2020 --
Event 39 Portrait travant king of thracia feh.png
Travant: King of Thracia
October 16, 2020-October 18, 2020 --
Event 40 Portrait heath wandering knight feh.png
Heath: Wandering Knight
October 21, 2020-October 23, 2020 --


  • The Feh Channel that first revealed Mjölnir's Strike blurred out the Dökkálfar Briar in the structure list to conceal the fact that the video in question was the one that revealed the impending start of the Book IV era in a later portion; the Dökkálfar Briar is themed to the enemy faction of Book IV.
  • The Heroes Twitter accounts use definitions of the Rest and Brace phases that differ from the actual game mechanics. Those definitions imply the Brace phase begins two days before the Strike phase, with all other points between one event's Counter and another's Strike being a Rest phase; as such, the Heroes Twitter accounts have announced Rest phases that never actually took place due to the subsequent event already being part of the game's data and thus going straight from Counter to Brace.[1]

Etymology and other languages

Names, etymology and in other regions
Language Name Definition, etymology and notes
English Mjölnir's Strike



  1. Example: This tweet announced the start of a Rest phase after the Clarisse: Sniper in the Dark round, with this tweet announcing the start of the Brace phase before the Berkut: Prideful Prince round. In reality, due to the Berkut round's data having been added to the game during the Clarisse round, the game went straight from Clarisse's Counter to Berkut's Brace without a Rest phase.

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Book II 1: The Flame • 2: Princess of Ice • 3: Guided by a Dream • 4: Fiery Resolve • 5: Blood and Snow • 6: The True Quarry • 7: Snow and Ash • 8: Rite of Frost • 9: Hellfire • 10: The King's Demise • 11: Prince of Ice • 12: Seeping Poison • 13: A Way Home
Book III 1: Death • 2: The Dread Gate • 3: Countdown • 4: A King's Worth • 5: A Father's Legacy • 6: Realm of the Dead • 7: A Home Unknown • 8: Truth of a Name • 9: Cohort of the Dead • 10: Omnicidal Witch • 11: Where It Began • 12: Lethal Swordsman • 13: Marvelous Dream
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Xenologues 1: Detached Princess • 2: The Brink of Chaos • 3: The People's Hero • 4: Whispers of Death • 5: Heavenly Witness
Locations The Sacred WorldWorld of AwakeningWorld of BindingWorld of BirthrightWorld of BlazingWorld of ConquestWorld of DawnWorld of Holy WarWorld of MysteryWorld of RadianceWorld of ShadowsWorld of ThraciaWorld of Zenith (Askran KingdomDökkálfheimrEmblian EmpireHelLjósálfheimrMúspellNifl)
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