Why would you "keep" them for harder battles ? Units are there to use them. If you're in danger of running out of Skellies, just make sure you restore them before the battle ends.
Btw in combats where you see that you cannot out-dps the enemy before he starts spamming Geyser for instance it is very much advised to refrain from using non-resurrectable units or those that can't restore themselves (Vampires, Ancient Vampires, Cursed Ghosts, Inquisitors). So if anything, then it's the hard battles where you do NOT use Skellies :> Not the other way around.
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