It seems a titanic task, but the horrid thing must fall. Holy light is their best weapon. Kellon repeats his invocation. "Heartseeker!"
Spoiler: OOC
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Kellon casts Guiding Bolt again.
Spell Attack: (1d20+5)[23]
Damage: (4d6)[14] Radiant
Hit, Advantage, yadda yadda.