EO4/Fortress/Skills

This page details full data for the Fortress's skills in Etrian Odyssey IV: Legends of the Titan.

Novice skills (Lv. 1)

Proficiency 城塞騎士の心得
Class Skill Recover some TP each time you're attacked while on the front line. A skill to stoke the party's fighting spirit by standing in the front line as a shield for the others. Triggers even if the attack gets evaded or negated.
Level	1
Fixed TP Recovery	3

Bolt Strike ボルトストライク
Mace Skill Melee volt bash attack to 1 enemy. A skill that crushes an enemy with a volt-imbued mace. Body part used: Arms Stat(s) used: STR
Level	1	2	3	4	5	6	7	8	9	10
TP Cost	8				9					10
Damage	150%	157%	164%	170%	190%	194%	198%	202%	206%	220%
Action Speed	-3

Holy Smite ホーリーバッシュ
Mace Skill Melee bash attack to 1 enemy. Recovers some HP. A skill that strikes an enemy with a mace imbued with holy powers. Body part used: Arms Stat(s) used: STR Prerequisite skill(s): Bolt Strike, lv. 3
Level	1	2	3	4	5	6	7	8	9	10
TP Cost	10				12					14
Damage	145%	150%	155%	160%	175%	179%	183%	187%	190%	200%
% Damage as Healing	70%				75%					80%
Hit Rate Modifier	-3%
Action Speed	-5		-4		-3		-2		-1

Ally Shield ディバイドガード
Shield Skill Protects 1 ally for this turn and takes any damage they would sustain. A skill wherein you stand in front of an ally to act as their shield. Does not protect from skills that inflict debuffs or ailments/binds without doing damage. While redirecting damage this way, damage taken by the user will treat as if they are in the front row, and will not be subject to halved damage if either the user or the defended ally is in the back. Body part used: Arms
Level	1	2	3	4	5	6
TP Cost	3
Damage Decrease	10%	20%	25%	29%	32%	35%
Action Speed	+30

Strike Guard 防御陣形
Support Skill Increases all allies' physical defense for 3 turns. A skill that organizes a battle formation to anticipate enemy attacks. Body part used: Head
Level	1	2	3	4	5	6
TP Cost	12
Physical DEF Increase	15%	18%	20%	22%	24%	25%

Element Guard 防御陣形Ⅱ
Support Skill Increases all allies' elemental defense for 3 turns. A skill that organizes a battle formation to anticipate enemy attacks. Body part used: Head Prerequisite skill(s): Strike Guard, lv. 3
Level	1	2	3	4	5	6
TP Cost	12
Physical DEF Increase	15%	18%	20%	22%	24%	25%

Taunt 挑発
Support Skill Increases chance of enemies targeting you for 4 turns. A skill that draws the enemy's attention, making you a decoy for the rest of the party. By default, all party members have an aggro value of 0 to 4. Body part used: Head
Level	1	2	3	4
TP Cost	2
Aggro Value Increase	3-4	3-6	3-8	3-9
Action Speed	+20

Auto-Taunt 先制挑発
Auto Skill Taunt may activate at the start of battle. A skill that allows you to enter a battle prepared. Due to how the game ticks down buff counters, the user starts the battle with four turns of Taunt instead of three. Prerequisite skill(s): Taunt, lv. 2
Level	1	2	3	4
Activation Rate	15%	25%	35%	50%

Iron Wall 物理防御ブースト
Passive Skill Increases your defense against physical attacks. This skill can be strengthened through training.
Level	1	2	3	4	5	6	7	8	9	10
Physical DEF Increase	5%	9%	12%	15%	17%	19%	21%	23%	24%	25%

Mineralogy 鉱物学
Passive Skill Greater chance of finding extra ore when mining. The effects of this skill stack if another party member also has it.
Level	1
Rare Material Rate	10%

Veteran skills (Lv. 20)

Expertise 城塞騎士の極意
Class Skill Recover more TP each time you're attacked while on the front line. A skill to stoke the party's fighting spirit by standing in the front line as a shield for the others. Overwrites the bonus from Proficiency. Triggers even if the attack gets evaded or negated. Prerequisite skill(s): Proficiency, lv. 1
Level	1
Fixed TP Recovery	4

Vengeance Bash リベンジスマイト
Mace Skill Strong melee bash attack to 1 enemy after 3 turns. The attack increases in strength with each time you are attacked before it activates. Between this skill's setup action and the attack landing, the first instance of damage taken applies a multiplier to the damage that starts at ×1.4. Every subsequent instance of damage taken increases the multiplier by 0.4, to a maximum of ×5.0 for 10 hits taken. If the user was not damaged at all, it only hits for base damage. Poison damage and self-damage from Earth Break contribute to this. Curse recoil damage, Shockwave's HP cost, or Blood Surge's HP loss do not contribute. Damage multiplier is also subject to diminishing returns. The action speed modifier only applies to the setup action. The delayed attack has no speed modifier. Body part used: Arms Stat(s) used: STR Prerequisite skill(s): Holy Smite, lv. 2
Level	1	2	3	4	5	6	7	8
TP Cost	14			16				18
Base Damage	180%	195%	210%	250%	260%	270%	280%	300%
MAX Damage	900%	975%	1050%	1250%	1300%	1350%	1400%	1500%
Hit Rate Modifier	-5%	-4%	-3%	-2%	-1%
Action Speed	-100

Line Shield ラインディバイド
Shield Skill Protects one line for this turn and takes any damage they would sustain. A skill wherein you stand in front of an ally to act as their shield. Does not protect from skills that inflict debuffs or ailments/binds without doing damage. While redirecting damage this way, damage taken by the user will treat as if they are in the front row, and will not be subject to halved damage if either the user or the defended ally is in the back. Body part used: Arms Prerequisite skill(s): Ally Shield, lv. 3
Level	1	2	3	4	5	6
TP Cost	10
Damage Decrease	5%	8%	10%	12%	14%	15%
Action Speed	+30

Party Shield オールディバイド
Shield Skill Protects the party for this turn and takes any damage they would sustain. A skill wherein you stand in front of an ally to act as their shield. Does not protect from skills that inflict debuffs or ailments/binds without doing damage. While redirecting damage this way, damage taken by the user will treat as if they are in the front row, and will not be subject to halved damage if either the user or the defended ally is in the back. Body part used: Arms Prerequisite skill(s): Line Shield, lv. 3
Level	1	2	3	4	5	6
TP Cost	20
Damage Decrease	5%	8%	10%	12%	14%	15%
Action Speed	+30

Knight's Boon 騎士の加護
Passive Skill Increases your natural recovery rate from ailments and binds. Adds a bonus to the ailment/bind recovery formula.
Level	1	2	3	4	5	6
Recovery Rate Increase	25%	32%	38%	43%	47%	50%

Holy Blessing 聖なる加護
Support Skill Protects a line of allies from one status ailment over 3 turns. Dispels itself for the ally once successfully blocking an ailment. Does not protect from binds, stuns, or instant death. Prerequisite skill(s): Knight's Boon, lv. 3
Level	1	2	3	4
TP Cost	14	12	9	6
Action Speed	+6

Rampart ランパート
Support Skill Increases your physical and elemental defense for 3 turns. A skill to strengthen your guard into an impenetrable defense.
Level	1	2	3	4	5	6
TP Cost	8
DEF Increase	20%	23%	25%	27%	29%	30%

Healing Wall ヒールウォール
Passive Skill When allies in your line Defend, they recover some HP.
Level	1	2	3	4	5	6	7	8
Fixed HP Recovery	10	15	20	25	29	33	37	40

Sentry 歩哨
Dungeon Skill See the location of FOEs on the map for a certain number of steps.
Level	1	2	3	4	5	6
TP Cost	6		7		8
Radius (Tiles)	1	3	4	6	8	10
Duration (Steps)	30	40	50	60	80	100

Hardy Chef 屈強料理
Sky Skill Increases VIT gains from cooked food. The effects of this skill stack if other party members also have it. Also reduces the VIT penalty from food.
Instances	1	2	3	4	5
VIT Increase	44%	63%	77%	89%	100%
VIT Penalty Decrease	44%	63%	77%	89%	100%

Master skills (Lv. 40)

Enlightenment 城塞騎士の悟り
Class Skill Recover more TP each time you're attacked while on the front line. A skill to stoke the party's fighting spirit by standing in the front line as a shield for the others. Overwrites the bonus from Expertise. Triggers even if the attack gets evaded or negated. Prerequisite skill(s): Proficiency, lv. 1
Level	1
Fixed TP Recovery	5

Earth Break アースブレイク
Mace Skill Melee bash attack with a splash effect. Also damages yourself. A skill that performs a powerful strike which shakes the very earth. Damage done to self is reduced by the user's VIT and any Bash resistance equipment. Armor DEF bonus has no influence on self-damage. Body part used: Arms Stat(s) used: STR Prerequisite skill(s): Vengeance Bash, lv. 2
Level	1	2	3	4	5	6	7	8
TP Cost	24			27				30
Damage	285%	300%	315%	345%	354%	362%	370%	390%
Action Speed	-3

Weak Shield ディバイドモード
Shield Skill Takes damage in place of allies with under 50% HP for 3 turns. A skill that readies oneself to protect wounded allies. Body part used: Arms Prerequisite skill(s): Party Shield, lv. 3
Level	1	2	3	4	5	6
TP Cost	20
Damage Decrease	5%	8%	10%	12%	14%	15%
Action Speed	+6

Guard Mastery ガードマスタリ
Passive Skill May block physical/elemental attacks against you while in the front line. An advanced defensive skill that parries enemy attacks. Does not protect from untyped damage. Prerequisite skill(s): Weak Shield, lv. 2
Level	1	2	3	4	5	6	7	8
Activation Rate	4%	7%	10%	12%	13%	14%	15%	16%

HP Boost HPブースト
Passive Skill Increases your maximum HP. This skill can be strengthened through training.
Level	1	2	3	4	5	6	7	8	9	10
MAX HP Increase	10%	15%	19%	23%	27%	30%	33%	36%	38%	40%

References

• Datamining for Fortress's skills by DrFetus/Araxxor and HououinMakise
• Skill simulator