Trouble with Bass Azz Beholders in the Mines

[Quelthos]

What are the best units you have access to? You listed a lot of melee units. Archmages, cannoneers, and beholders are probably good choices because they can hit from range, have decent health, and shouldn't be as likely to fall asleep. You could also put glot's armor on a ranged unit if you have it. You could use something like fireflies + haste to cross the map quickly, but you risk them being isolated vs. any enemy ground troops. Gryphons with some form of shield spell might be a better choice.