So I have read numerous posts trying to find any information on this topic and it’s never clear. I have unlocked wither skeletons and only have one more nether island to go. Some people suggested side quests which I thought maybe that’s it, I’ve done a ton of old blue quests. Nothing has unlocked being able to buy them. I’m about to turn in my nether wart quest for 50,000 collection. Which I believe to be one of the last quests before the last nether island unlock. Can anyone that’s unlocked them shed any light on to this topic for me please? Thanks!