Helpful Wizards (Forge Edition)
This mod adds Wizard towers to mountain peak biomes (frozen peaks, jagged peaks, etc).
Wizard mobs spawn in the towers, which is a special kind of villager. Like villagers, they will trade for unique useful items and will be targeted by zombies and pillagers.
Unlike villagers, wizards are neutral and will defend against attackers (similar to piglins).
The wizards buy echo shards and sell staffs, that give useful potion effects when used. 
This mod aims to encourage exploration of both the deep dark and mountain peaks!
Also available for Fabric.