Rarity: 5 stars
Rarity: 5 stars
Regular Attack
Arts Damage

Corroserum is a Blast Caster with a fairly straightforward kit: He’s able to either focus entirely on damage or provide a long-range silence utility. While he does have a dedicated damage option, it sadly isn’t very good and the primary focus when using him should instead go towards his ability to silence with his attacks. In this way, he can be situationally useful to players who may need long range AOE silence options for some levels.

Trait:Deals AOE Arts damage in a long line

Operator Stats

Attack Power
Attack Speed
2.9 sec
Arts Resistance
Redeploy Time
70 sec
DP Cost
X1operator cellactive cellactive cellactive cellactive cellactive cell

The main takeaway here is that he’s noticeably behind Ifrit in the ATK department. His skills do have fairly sizable ATK buffs, but his kit scales poorly and he still has very slow attacks. This is what ultimately makes him only useful for his utility.


  • Long range AOE silence capability
  • Talent helps greatly during downtime so abilities are up when needed
  • Manual skill deactivation gives you control so that uptime isn’t wasted


  • Damage output is overall lacking
  • Very expensive to deploy
  • Silence is either very useful or mostly useless; limits his usefulness in general content


Tactical Readjustment

After not attacking for 4 seconds, own SP recovery rate +0.45/second

This talent is fine and not difficult to make use of; there will usually be downtime where he will have the opportunity for the talent to activate. It makes his uptime noticeably better, especially with his first skill, where the self-stun guarantees this talent activates.


Focus Overload

Per Second RecoveryManual Trigger
Initial SP
SP Cost
30 sec

ATK +135%. Corroserum is Stunned for 10 seconds after skill duration

This skill is nothing but a large damage boost with some decent uptime. The self-stun synergizes with his talent, allowing it to activate and greatly boost his passive SP regeneration and improving uptime. This helps this skill have a higher average DPS than his second skill despite the loss of attacks from the self-stun. The damage output however still isn’t that good and not worth using over S2, which is close enough in damage and at least has some utility.

Skill Mastery

Recommended Rank

The skill gains nothing except more damage from masteries. The damage is overall rather mediocre even when he’s fully maxed and definitely isn’t a worthwhile investment.

Recommended Skill

Conductive Corrosive Blast

Per Second RecoveryManual Trigger
Initial SP
SP Cost
25 sec

ATK +100% and attacks silence the targets for 5 seconds
Can manually deactivate skill (skill can be deactivated at will)

This skill trades some damage output from S1 for the added utility of inflicting silence on every attack. His long range and AOE attacks makes it easy for him to silence who you need to be silenced since you’re not limited by targeting priority. It’s also useful to actually silence them long before they’re in range to be a threat; making them easy pickings as they get closer and are dealt with by the rest of your team. Either that, or he can help cover multiple lanes once they get close to your main line, especially when facing, for instance, exploding slugs. The skill has a manual deactivation, allowing you to not waste uptime and start charging its next use.

It’s decent utility, but obviously depends a lot on the map and enemies you’ll be facing. His usefulness is very limited due to this, but he can be a decent pick to keep in mind if a situation where it’s relevant pops up - especially since he doesn’t need much investment to fulfill that role.

Skill Mastery

Recommended Rank

This mastery’s improved ATK only brings it up to par with the first skill’s damage output at SL7, which is far from impressive. The improved silence duration also isn’t very meaningful; as long as Corroserum is put into a decent enough position it’ll be easy for him to keep enemies silenced since it already has a decent enough duration. It’s another rather mediocre mastery investment, so save your resources.

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Last updatedJanuary 15, 2022