ToV Sell Me on Tales of the Valiant

[Whizbang Dustyboots]

Tell them to unleash a barrage of lower level spells like command and other save or suck spells. Either they end up contributing, or they eat away at LR until they can unleash hell.

Yeah, attrition is the name of the game with those sorts of defenses. And luckily, at level 20, they have a plethora of low level spells, some of which can still matter if they're not resisted.