Lazy Tank [Merulina Guardian] Yareli for speedrunning on Merulina or running base steel path missions (can tank up to around level 500 comfortably e.g. EDA/ETA).

[Combat Discipline] helps [Yareli] take damage to activate [Merulina Guardian] and [Archon Intensify] since it requires actual healing in order to activate both. [Combat Discipline] also helps consistent activation of Arcane Avenger which is optional.

Why Gloom?
Gloom is the only ability that you can keep active while staying on Merulina permanently, and also constantly heals both you and merulina.