Fire Emblem Heroes (FEH)

Sirius Builds and Best IVs

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This is a ranking page for the hero Sirius - Mysterious Knight from the game Fire Emblem Heroes (FEH). Read on to learn the best IVs (Individual Values), best builds (Inherit Skill), weapon refinement, stats at Lv 40, and more for Sirius.

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[8.5/10]
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[8.5/10]

Sirius Rating and Basic Information

FEH Sirius Banner

Overall Rating 8.5/10
Reroll Ranking (excluding Inherit Skill) A
(▶Reroll Ranking)
Ranking (including Inherit Skill) A
(▶FEH Tier List)

Sirius - Mysterious Knight: Basic Information

Color / Weapon Type / Move Type
Rarity
What Kind of Character Are They? ・Can quickly trigger specials
・Gains a significant buff when there are no nearby allies
・Nullifies enemy buffs while inflicting penalties

Sirius Skills at 5★


Might: 16  Range: 1
Accelerates Special trigger (cooldown count-1). If unit is not adjacent to an ally, grants Atk/Spd/Def/Res+4 during combat.

Cooldown Count = 3
Treats foe's Def/Res as if reduced by 50% during combat.

If unit is not adjacent to an ally, grants Atk/Spd +6 during combat.

Inflicts Atk/Spd-3 on foe and neutralizes foe's bonuses to Atk/Spd (from skills like Fortify, Rally, etc.) during combat.

Sirius Best IVs

Recommended IVs

Stat Superboon/Superbane IV Recommendation
HP (18) HP Superbane ★★★☆☆
Atk (24) No Attack IV ★★★★☆
Spd (9) No Spd IV ★★★★★
Def (9) No Def IV ★★★☆☆
Res (3) Res Bane ★★☆☆☆

◯ = Stat gains +4 with a superboon, ✕= Stat goes down by -4 with a superbane, - = No assets or flaws

See the IV Checker for All Units Trait Fruits—How to Change IVs

When using an Ascendant Floret, we recommend getting the next superboon if it fits the hero. If not, consider what stat your hero needs most.

+Spd/-Res

The best IVs for Sirius are +Spd and -Res. A higher Spd stat allows Sirius to get a ton of follow-up attacks on his foes. It also protects him from hostile follow-up attacks. His Res of is less importance and thus safe to be taken as a bane. Be wary as this is a superbane! Get that merge as fast as possible to eliminate it.

+Atk for a +10 Merge

We recommend a +Atk IV when merging Sirius to 10. At +10 Merge Sirius' Spd will reach such high levels that pushing it up higher is a waste, considering he has access to Atk/Spd Solo 3 & Lull Atk/Spd 3. At this point, it would be better to opt with a +Atk IV instead to help him deal more raw damage with the numerous follow-up attacks he will be landing.

Sirius Best Builds

Budget Sirius

Special Skill IconLuna
Emblem Icon: -
Attuned Skill Icon: -

How to Use, Explanation

A budget build for Sirius that grants bulk and bite for both phases of the game.

Heavy Galeforce Sirius

Special Skill IconGaleforce
Emblem Icon: -
Attuned Skill Icon: -

How to Use, Explanation

This is a Galeforce set for Sirius that relies on Solo Atk buffs to trigger Heavy Blade 3 for consistent Galeforce activations. Since he will be trading hits, he will be conveniently in Desperation 3 range so Summoners might was well take advantage. Ardent Sacrifice is also taken to provide him with another mechanic to safely go into Desperation range.

Riposte Counter Sirius

Special Skill IconGlimmer
Emblem Icon: -
Attuned Skill Icon: -

How to Use, Explanation

This is a simple, and relatively cheap build for Sirius that aims to make him a threat in the enemy phase. Distant Counter and Quick Riposte 3 allow him to dish lots of damage to a wide range of foes when attacked.

Source Heroes for All Skills

Sirius Best Weapon Refine

Effect of Sirius's Refined Weapon

Exclusive Weapon Effect from Refining (Special Effect Type)
SP: 400
Might: 16 Range: 1 HP: 3
Accelerates Special trigger (cooldown count-1). If unit initiates combat or is not adjacent to an ally, grants Atk/Spd/Def/Res+4 to unit and neutralizes effects that guarantee foe's follow-up attacks and effects that prevent unit's follow-up attacks during combat.
At start of combat, if unit's HP ≥ 25%, grants Atk/Spd/Def/Res+X to unit during combat (X = number of spaces from start position to end position of whoever initiated combat × 2, + 4; max 10), and reduces damage from foe's first attack by 30%.
Arena Medal:500 Divine Dew:200

We recommend the Special Effect Refine for Sable Lance

Refined Sable Lance grants scaling stat bonuses, a full Null Follow-Up effect, and 30% damage reduction on foe's first attack.

The Null Follow-Up effect alone is worth refining Sable Lance for, and the bonus stats are also appreciated.

Sirius Stats

Stat Rankings

Neutral Stats at Lv. 40 (5★)
162
HP
HP 40 40
Rank: 472/1160
Atk
Atk 34 34
Rank: 802/1160
Spd
Spd 37 37
Rank: 416/1160
Def
Def 35 35
Rank: 227/1160
Res
Res 16 16
Rank: 1112/1160

Stat Values

Lv 40+10 Stats (5★)

HP Atk Spd Def Res Total
+10 Merges W/ Skill Bonuses 45 54 42 40 20 201
Lv.40 +10 45 38 42 40 20 185

HP Atk Spd Def Res Total
+HP
Lv.40 +10
47 38 41 39 20 185
+Atk
Lv.40 +10
44 41 41 39 20 185
+Spd
Lv.40 +10
44 38 44 39 20 185
+Def
Lv.40 +10
44 38 41 42 20 185
+Res
Lv.40 +10
44 38 41 39 23 185

Stats at Lv 40

HP Atk Spd Def Res Total
5★- Adjusted for Skills 40 50 37 35 16 178
5★ Lv.40 40 34 37 35 16 162

Initial Stats (with Skills)

HP Atk Spd Def Res Total
5★ Lv.1 18 24 9 9 3 63

Stat Comparison of Similar Heroes

Hero
HP
Atk
Spd
Def
Res
Total
41 46 48 38 22 195
40 47 45 32 21 185
40 44 47 32 21 184
38 43 46 32 25 184
40 45 45 31 18 179
41 41 44 32 21 179
41 42 42 37 17 179
40 42 38 36 18 174
39 40 42 28 24 173
40 37 41 34 20 172
41 36 38 35 18 168
39 38 40 27 23 167
37 35 40 28 27 167
39 34 42 25 26 166
38 32 37 28 27 162
Sirius Icon Sirius
40 34 37 35 16 162
40 37 35 32 18 162
41 32 38 28 18 157

Note: Stats bonuses from skills are not taken into account.

Sirius Roles, Strengths, and Weaknesses

Sirius Roles

Sirius - Mysterious Knight Roles
Close Physical Attack ImageClose-Physical Ranged Physical AttackRanged-Physical Close Magic AttackClose-Magic Ranged MagicRanged-Magic
Physical Wall ImagePhysical Wall Magic WallMagic Wall Effective ImageEffective Weapon Movement Assist ImageMovement Assist
Exclusive Skill ImageExclusive Skill No All Range Counterattack ImageAll-Range Counter RecoveryRecovery No Refresher ImageRefresher
No Legendary Hero ImageLegendary No Mythic Hero ImageMythic No Duo and Harmonized ImageDuo /
Harmonized
No Resplendent ImageResplendent

Sirius is a close physical attacker (range = 1). Therefore, when not accounting for the Weapon Triangle, the amount of damage he deals will be equivalent to his Atk minus the foe's Def stat.

Sirius Strengths

Very strong solo unit

Atk/Spd Solo 3 grants him an Atk/Spd boost in combat if he is not adjacent to an ally. Sable Lance on the other hand grants an all-stat boost with the same trigger condition. Together, these 2 skills grant him +10 Atk/Spd +4 Def/Res. This is a massive boost and the trigger condition is very easy to meet. If you need more boosts, these buffs completely stack with buffs like Hone Cavalry and Goad Cavalry.

In addition, Sable Lance also accelerates his special trigger by 1 counter. This puts Luna on a cooldown of 2.

Casts penalties on enemy Atk and Spd

Sirius has the B skill Lull Atk/Spd, which will inflict Atk/Spd-3 on a foe in combat, and nullify bonuses to those stats. This will decrease foes' damage and Sirius' rate of follow-up attacks, and it has the powerful property of nulliying Atk/Spd buffs.

Another reason why this skill is great is because Atk/Spd buffs are very common in the game. This is because Atk/Spd are the most important stats on an offensive unit.

Sirius Weaknesses

Weak to Cavalry Effective Weapons

Sirius takes 1.5x damage from cavalry-effective weapons like Ridersbane, and one blow from this type of weapon is sure to take him down. Make sure you know what weapons you are up against before hopping too far into the line of battle!
Heroes with Effective Skills

Should you Unlock Potential?

Should You Unlock Potential for this Hero? Cannot Unlock Potential

Sirius - Mysterious Knight Only Appears as a 5 Star Hero!

Sirius - Mysterious Knight only appears as a 5 Star Hero. We will include whether or not you should Unlock Potential for Sirius - Mysterious Knight if a 4 Star version is released!

Unlock Potential Tier List

Sirius - List of Skills

Weapons

Skill Name Might Range Effect Learned At
6 1 No Effect 5★
8 1 No Effect 5★
11 1 No Effect 5★
16 1 Accelerates Special trigger (cooldown count-1). If unit is not adjacent to an ally, grants Atk/Spd/Def/Res+4 during combat. 5★

Assists

This Hero has no Assist skills that can be learned.

Specials

Skill Name Effect Learned At
(Cooldown Count = 3) Resolve combat as if foe suffered Def/Res -30%. 5★
(Cooldown Count = 3) Treats foe's Def/Res as if reduced by 50% during combat. 5★

Passives

Skill Name Effect Learned At
If unit is not adjacent to an ally, grants Atk/Spd +2 during combat. 5★
If unit is not adjacent to an ally, grants Atk/Spd +4 during combat. 5★
If unit is not adjacent to an ally, grants Atk/Spd +6 during combat. 5★
Inflicts Atk/Spd-1 on foe and neutralizes foe's bonuses to Atk/Spd (from skills like Fortify, Rally, etc.) during combat. 5★
Inflicts Atk/Spd-2 on foe and neutralizes foe's bonuses to Atk/Spd (from skills like Fortify, Rally, etc.) during combat. 5★
Inflicts Atk/Spd-3 on foe and neutralizes foe's bonuses to Atk/Spd (from skills like Fortify, Rally, etc.) during combat. 5★

Sirius as a Source Hero

Sirius Avatar

Value of Skills ★★★★☆

Inheriting Atk/Spd Solo 3 and Lull Atk/Spd 3

Sirius can be used to inherit the skills Atk/Spd Solo 3 and Lull Atk/Spd 3. However, units with these skills are limited, so think carefully on which unit you plan to fodder this skill off to.

How to Get Sirius / Illustrations / Voice Actor / Quotes

How to Get Sirius

Obtain Through Regular Summon

Sirius is a Hero who can be pulled from any summon.

Note: Not currently a featured hero in any Summon events.

Current Focuses and Which You Should Pull From

Voice Actor and Illustrator Information

Voice Actor
(English)
Patrick Seitz
Illustrator スエカネクミコ
Appears In

Illustration

Quotes: Special Triggered

Special Triggered Quotes are voice lines that play upon activating a Special attack.

Prepared, are you?
No escaping this!
How irksome…
Ah! Some amusement!

Lv 40 5★ Dialogue

Lv 40 5★ Dialogue become available when a hero attains Lv. 40 at 5★ rarity.

The Order of Heroes is a beautiful thing. The patriots of a righteous land... I can relate to that.
I, too, gave up everything to fight for my country, king, and people…
Every thrust of my lance reinforced that there were no other paths for me than to live and die as a knight.
When I finally lost everything, I met some people who showed me what it meant to fight for those you love.
If I had known then what I know now, perhaps I would have met with a different fate—as would have others…
...Ahem. I fear I've said too much. Please, forget all that. Now, I fight for you alone, and that is all I am.

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