Cognomen's Cassowary
First Post
Well, blocking vision would help with the confusing gaze, to be sure, but an umber hulk has termorsense, so I qua DM would rule that it would not suffer the penalties of being blinded the way the party would. With a high Con, it has a reasonable chance to pass the saves, as well. You should have just lightning bolted it in the face.
Even if you are flinging fire bolts at its 18 AC, you have blocked your allies from casting spells and using features that require sight. Vicious mockery, Tasha's hideous laughter, sacred flame, healing word, hunter's mark, hex, chromatic orb, magic missile, protection fighting style, barbarian's danger sense, cutting words, uncanny dodge, a number of channel divinities--those all are affected and all have common applications.
That is the generic problem, any time you cast a spell that creates a heavily obscured area, whether with careful spell or not.
Even if you are flinging fire bolts at its 18 AC, you have blocked your allies from casting spells and using features that require sight. Vicious mockery, Tasha's hideous laughter, sacred flame, healing word, hunter's mark, hex, chromatic orb, magic missile, protection fighting style, barbarian's danger sense, cutting words, uncanny dodge, a number of channel divinities--those all are affected and all have common applications.
That is the generic problem, any time you cast a spell that creates a heavily obscured area, whether with careful spell or not.