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There isn't much new on B4 of the Earth Cave, though TROLLS are a common foe for the first time. None of the encounters here are entirely trivial, unless you're lucky enough to encounter WrWOLVES without a GIANT. The enemies here are designed to wear you down as you make your way towards LICH, but hang in there and you'll make it in the end. Remember that your main offense against LICH will be support Spells, so other Spell slots can be used to bypass dangerous encounters once you start getting close to his lair.