netherite tier stuff (EXTREMELY rare ), for example every 1 in 100 diamond ore is netherite ore. (i forgot to mention the rarity last time i posted this) and only appears on nether maps. AND the emerald ore cannot drop it, as an enchanted item.
and also end, and nether themed maps.
ALSO hostile mobs could spawn in gold ore. just a suggestion, PLEASE do not shout at me in the comments. also make diamond ore rarer, but not gone entirely.