I suffered to get it bot it’s worth it
Use before killing lots of baby gigas lots of xp
You can get black pearls from squids and lobster things in the ocean.
Use to tame the rainbow centipede in caves and on scorched earth
Use it before completing swamp or yeti cave for extra xp
for taming an arthropluera this is the item you need to craft since it likes only take 1 at any level (if your on mobile it takes 1 for 300 and 450 for hard and brutal difficulty players)
Use it before birthing/taming a reaper
Unsure if this works and currently no way to test it but take a dump at a toilet eat this and finds a 4x explorer note for most exp ever?
I would advise you give this to your underwater creatures. This way you would level them faster and they would be better in the caves where you can't get them explorer notes.