I'm currently trying to solo vet Graven Deep, and struggling with the second boss. There's a mechanic with sacrifice skeletons: if the boss "eats" them, it grows in size and its attacks hit harder. I'm a melee character, so there's no way I can play this mechanic, as the boss consumes the sacrifices when they're nearby. This way, I need to mitigate a lot of damage. This is actually fine, because its default attacks aren't really instant and I can even dodge them if needed. The main problem is its size. The boss becomes very big and it somehow messes with its hitboxes or something, and as a result, my skills refuse to fire (brawler for example) and my char just spams light attacks when I try to weave (without weaving skills also won't fire). Sometimes I need to press the skill button many-many times before the skill fires. It's only the case when the boss consumes all the sacrifices, until that everything is smooth. If I target the adds then everything is okay, and all skills work as intended.
So is it intended? Is there a way to beat it solo or I should move onto the next dungeon?