As darkened druid once dawned this crown he unable to turn to beast instead formed into creature slain by his hand

Allows a druid to wild shape into enemies of intelligence of 6 or lower but you are unable to wild shape into any beast

You must first expose the crown to the flesh of the enemy you slayed (as long as you helped)

Normal druid CR rules apply to the enemies you want to wild shape into.

You are only able to save 2 creature per long rest.