Seems undignified for a couple of spell-casters, but I'll give it a shot.
On a similar note, would the Grease spell actually slow the buggers down, or would they make the Dex save? Better yet, could the Grease slick be set on, you know, FIRE?
Funny you should mention it but grease does ignite in Bg3 when exposed to flame.
You could also pepper them with Guiding Bolts (ranged caster attack), Inflict Wounds (melee range caster attack) from Shadowheart
