On GitHub, I don't see anything in the changeWand method of the Transmutation scroll's code limiting it to not generate a Regrowth wand. And the item Generate class sets the default probabilities to the same for all wands. Is there somewhere else this could be affected? I looked around, but couldn't find any comments indicating Regrowth wand was blocked in Transmutation wand generation. I guess I'm just (un)lucky with the RNG in this particular context. 😅

private static Wand changeWand( Wand w ) {
	Wand n;
	do {
		n = (Wand)Generator.randomUsingDefaults( Generator.Category.WAND );
	} while ( Challenges.isItemBlocked(n) || n.getClass() == w.getClass());
	
	n.level( 0 );
	int level = w.trueLevel();
	n.upgrade( level );

	n.levelKnown = w.levelKnown;
	n.curChargeKnown = w.curChargeKnown;
	n.cursedKnown = w.cursedKnown;
	n.cursed = w.cursed;
	n.curseInfusionBonus = w.curseInfusionBonus;
	n.resinBonus = w.resinBonus;

	n.curCharges =  w.curCharges;
	n.updateLevel();
	
	return n;
}

... WAND.classes = new Class[]{ WandOfMagicMissile.class, WandOfLightning.class, WandOfDisintegration.class, WandOfFireblast.class, WandOfCorrosion.class, WandOfBlastWave.class, WandOfLivingEarth.class, WandOfFrost.class, WandOfPrismaticLight.class, WandOfWarding.class, WandOfTransfusion.class, WandOfCorruption.class, WandOfRegrowth.class }; WAND.defaultProbs = new float[]{ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 };