Got Pearlescence from an elite fight, hit the campfire before the boss, and the minute I set foot in the boss room, the game crashed. Error log says there was an issue with the Pearlescence base card, I think. See cause from the crash log below:

Cause:
java.lang.ClassCastException: automaton.cards.goodstatus.UnknownStatus cannot be cast to cards.colorless.CardPearlescence
at cards.colorless.CardPearlescence.makeStatEquivalentCopy(CardPearlescence.java:146)
at com.megacrit.cardcrawl.actions.common.MakeTempCardInHandAction.makeNewCard(MakeTempCardInHandAction.java:248)
at com.megacrit.cardcrawl.actions.common.MakeTempCardInHandAction.addToHand(MakeTempCardInHandAction.java:98)
at com.megacrit.cardcrawl.actions.common.MakeTempCardInHandAction.update(MakeTempCardInHandAction.java:79)
at com.megacrit.cardcrawl.actions.GameActionManager.update(GameActionManager.java:179)
at com.megacrit.cardcrawl.rooms.AbstractRoom.update(AbstractRoom.java:325)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2532)
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:876)
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:423)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)