Geode
Inspiration and Concept
The development of this mod began under the influence of abukkezsaruj's work on village and monster modifications. The idea was to create a unique enemy that would introduce a new way of gathering resources into the game.
Mob Features
The Geode mod, working exclusively on Forge, adds a rare zombie variant to Minecraft - geodes. These stone creatures represent zombies that have spent so much time underground that their decaying bodies have been completely replaced by stones and minerals.

The image above shows the enemies you'll encounter. Each geode has 13 hearts of health and can only be found at specific height levels in the overworld.
Combat Tactics
Due to their stone nature, these enemies have increased knockback resistance, deal more damage, and have more health compared to regular zombies. Arrows are completely useless against them - projectiles simply bounce off their stone armor.
However, don't expect to encounter geodes often - their spawn chance is extremely low, making each encounter special.
Resource Gathering
An interesting feature: diamond geodes can drop both coal and diamonds. This is intentional - diamonds don't drop with 100% probability, and coal is considered as an unprocessed form of diamond in the context of this modification.