Horizon of Darkness

I thought that in the case of such a passive ability, it is calculated based on the number of charges. Well, let's go with the fifth one.
And what kind of check is it?

-- Oh, right, maybe we can distract them somehow with armor? Not yours, but that junk we found in the Dungeon with the rats. Let's make a ball out of various broken swords, axes, and armor, and roll it, let them shoot as much as they want? I'm a genius, right?
-- Henry, I think this plan is unrealistic, -- Kwen intervened. -- Even if the bugs are really attracted to static targets...
Henry examines the corpse (carefully, so as not to get into the acid, indestructible gloves should help).