If you mean you should have a backup, I agree. What I meant was that carrying nonmagical weapons because you might not want to fight monsters with your magical ones, to me, is laughable. It's contrary to virtually all heroic fiction. When did Aragorn say "Oop, better not use Anduril, this balrog's heat might melt it and then I'd be SOL. I'll just whip out my spare normal sword so Gandalf can buff it instead."?
There shouldn't even be a chance that a (supposedly) low CR creature like a babau can melt a holy avenger, but it is in fact a very real chance. It is an ability well out of proportion to the power of the creature, and a typical poorly-designed mechanic. Even if you toss heroic fiction comparisons aside, an ill-informed strike costing a character tens of thousands of gp worth of equipment is unbalancing to the game, IMO.
There shouldn't even be a chance that a (supposedly) low CR creature like a babau can melt a holy avenger, but it is in fact a very real chance. It is an ability well out of proportion to the power of the creature, and a typical poorly-designed mechanic. Even if you toss heroic fiction comparisons aside, an ill-informed strike costing a character tens of thousands of gp worth of equipment is unbalancing to the game, IMO.