Iboren

Iboren World is a fairly comprehensive mod designed for survival modded in 1.16.5.

• It adds new ores, creatures, armour, weapons and much more.
   
  Players will be able to make completely cheat tools and weapons, and will have to face monsters equipped in the same way.

The player will be guided by a book explaining everything about the mod, which will be given to them at the start of the game.

As far as ores are concerned, IBO & REN 

are more or less rare and can be found or crafted.
They can be used to create new items essential to survival and can be dropped by mobs.
Including the Ren Zombies! Appearing in particular in the Black Forest biome.