I was able to transform into Nob earlier in this run, but during a normal enemy encounter (Cultist and Chosen), transforming consistently crashes. Here's the log:

11:48:33.916 INFO basemod.BaseMod> publish on card use: Gremlin:FlipOut
11:48:33.943 INFO basemod.BaseMod> powers modified
11:48:34.063 INFO basemod.BaseMod> powers modified
11:48:34.304 INFO basemod.BaseMod> publish on post power apply
11:48:34.304 INFO basemod.BaseMod> powers modified
11:48:36.477 INFO basemod.BaseMod> publish on card use: Gremlin:Ward
11:48:36.504 INFO basemod.BaseMod> publish on post power apply
11:48:36.505 INFO basemod.BaseMod> powers modified
11:48:36.892 INFO basemod.BaseMod> publishPostExhaust
11:48:38.106 INFO basemod.BaseMod> publish on card use: Gremlin:Ward
11:48:38.132 INFO basemod.BaseMod> publish on post power apply
11:48:38.132 INFO basemod.BaseMod> powers modified
11:48:38.519 INFO basemod.BaseMod> publishPostExhaust
11:48:40.452 INFO basemod.BaseMod> publish on card use: Gremlin:Patsy
11:48:40.479 INFO basemod.BaseMod> publish on post power apply
11:48:40.479 INFO basemod.BaseMod> powers modified
11:48:40.919 INFO basemod.BaseMod> publish on post power apply
11:48:40.920 INFO basemod.BaseMod> powers modified
11:48:40.920 INFO basemod.BaseMod> powers modified
11:48:41.212 INFO basemod.BaseMod> publish on post power apply
11:48:41.213 INFO basemod.BaseMod> powers modified
11:48:41.719 INFO unlock.UnlockTracker> Already seen: Magnetism
11:48:41.746 INFO unlock.UnlockTracker> Already seen: Magnetism
11:48:45.853 INFO basemod.BaseMod> publish on card use: Gremlin:TagTeam
11:48:45.880 INFO unlock.UnlockTracker> Already seen: Gremlin:MadGremlin
11:48:45.880 INFO unlock.UnlockTracker> Already seen: Gremlin:SneakyGremlin
11:48:45.880 INFO unlock.UnlockTracker> Already seen: Gremlin:FatGremlin
11:48:45.881 INFO unlock.UnlockTracker> Already seen: Gremlin:GremlinWizard
11:48:49.202 INFO basemod.BaseMod> publish on post power apply
11:48:49.203 INFO basemod.BaseMod> powers modified
11:48:49.203 INFO basemod.BaseMod> powers modified
11:48:49.738 INFO unlock.UnlockTracker> Already seen: Magnetism
11:48:49.762 INFO unlock.UnlockTracker> Already seen: Magnetism
11:48:51.228 INFO basemod.BaseMod> powers modified
11:48:51.455 INFO basemod.BaseMod> publishPostExhaust
11:48:51.722 INFO basemod.BaseMod> publishPostExhaust
11:48:52.684 INFO basemod.BaseMod> publishPreMonsterTurn
11:48:53.256 INFO basemod.BaseMod> publish on post power apply
11:48:53.257 INFO basemod.BaseMod> powers modified
11:48:53.390 INFO basemod.BaseMod> publishPreMonsterTurn
DAMAGE CHECK: false 3
11:48:54.324 INFO basemod.BaseMod> publish on Player Damaged
DAMAGE CHECK: false 3
11:48:54.443 INFO basemod.BaseMod> publish on Player Damaged
11:48:54.617 INFO basemod.BaseMod> publish on post power apply
11:48:54.626 INFO basemod.BaseMod> powers modified
11:48:54.736 INFO basemod.BaseMod> publish on post power apply
11:48:54.737 INFO basemod.BaseMod> powers modified
11:48:54.856 INFO basemod.BaseMod> publish on post power apply
11:48:54.857 INFO basemod.BaseMod> powers modified
11:48:54.976 INFO basemod.BaseMod> publish on post power apply
11:48:54.987 INFO basemod.BaseMod> powers modified
11:48:55.086 INFO basemod.BaseMod> publish on Player Lose Block
11:48:55.087 INFO basemod.BaseMod> publishPostEnergyRecharge
11:48:55.110 INFO basemod.BaseMod> powers modified
11:48:55.230 INFO basemod.BaseMod> powers modified
11:48:55.351 INFO basemod.BaseMod> powers modified
11:48:55.470 INFO basemod.BaseMod> powers modified
11:48:55.684 INFO basemod.BaseMod> publishPostDraw
11:48:55.790 INFO basemod.BaseMod> publishPostDraw
11:48:55.897 INFO basemod.BaseMod> publishPostDraw
11:48:56.003 INFO basemod.BaseMod> publishPostDraw
11:48:56.110 INFO basemod.BaseMod> publishPostDraw
11:48:59.084 INFO basemod.BaseMod> publish on card use: Good Instincts
11:49:04.247 INFO basemod.BaseMod> publish on card use: Gremlin:Nob
11:49:04.793 INFO basemod.BaseMod> publish on post power apply
11:49:04.794 INFO basemod.BaseMod> powers modified
11:49:04.805 INFO core.CardCrawlGame> Exception occurred in CardCrawlGame render method!
11:49:04.806 ERROR core.CardCrawlGame> Exception caught
java.lang.IllegalArgumentException: Animation not found: idle
at com.esotericsoftware.spine.AnimationState.setAnimation(AnimationState.java:216) ~[?:?]
at skindex.modcompat.downfall.skins.player.gremlins.GremlinsAtlasSkin.loadOnPlayer(GremlinsAtlasSkin.java:103) ~[TogetherInSpire.jar:?]
at skindex.modcompat.downfall.skins.player.gremlins.GremlinsAtlasSkin$Patches$BecomeNobPatcher.Postfix(GremlinsAtlasSkin.java:161) ~[TogetherInSpire.jar:?]
at gremlin.characters.GremlinCharacter.becomeNob(GremlinCharacter.java:144) ~[?:?]
at gremlin.powers.GremlinNobPower.onInitialApplication(GremlinNobPower.java:36) ~[Downfall.jar:?]
at com.megacrit.cardcrawl.actions.common.ApplyPowerAction.update(ApplyPowerAction.java:268) ~[?:?]
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) [?:?]
Controllers: removed manager for application, 0 managers active
11:49:04.809 INFO core.CardCrawlGame> PAUSE()
11:49:04.810 INFO core.CardCrawlGame> Game shutting down...
11:49:04.810 INFO core.CardCrawlGame> Flushing saves to disk...
11:49:04.810 INFO core.CardCrawlGame> Shutting down controller handler...
11:49:04.810 INFO helpers.FileSaver> Save thread interrupted!
11:49:04.810 INFO core.CardCrawlGame> Shutting down publisher integrations...
11:49:04.810 INFO helpers.FileSaver> Save thread will die now.
11:49:04.813 INFO core.CardCrawlGame> Flushing logs to disk. Clean shutdown successful.

Game crashed.
Version Info:
- Java version (1.8.0_144)
- Slay the Spire (12-18-2022)
- ModTheSpire (3.30.3)
Mod list:
- basemod (5.55.1)
- stslib (2.11.0)
- spireTogether (6.4.19)
- downfall (5.2.04)

Mods in stacktrace:
- downfall (5.2.04)
- spireTogether (6.4.19)
Cause:
java.lang.IllegalArgumentException: Animation not found: idle
at com.esotericsoftware.spine.AnimationState.setAnimation(AnimationState.java:216)
at skindex.modcompat.downfall.skins.player.gremlins.GremlinsAtlasSkin.loadOnPlayer(GremlinsAtlasSkin.java:103)
at skindex.modcompat.downfall.skins.player.gremlins.GremlinsAtlasSkin$Patches$BecomeNobPatcher.Postfix(GremlinsAtlasSkin.java:161)
at gremlin.characters.GremlinCharacter.becomeNob(GremlinCharacter.java:144)
at gremlin.powers.GremlinNobPower.onInitialApplication(GremlinNobPower.java:36)
at com.megacrit.cardcrawl.actions.common.ApplyPowerAction.update(ApplyPowerAction.java:268)
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)