mob variants

Aquateton - An underwater skeleton variant. Its texture has coral and seagrass all over it and can breath underwater. A skeleton converts into an Aquateton if a skeleton goes in to water for 30 seconds. Shoots coral tipped arrows. New arrow type can be crafted with coral instead of flint. If you are hit with a coral tipped arrow you will be petrified for 2 seconds. Aquatetons usually spawn in large groups in coral reefs.  

The Frozen - An ice variant of the zombie. They will either deal 8 HP damage (18% chance), or deal 4 HP freezing damage (82% chance). If you right click them with a flint and steel, they will be lit on fire and convert to a normal zombie. A normal zombie will convert to a Frozen if they go in to powdered snow for 30 seconds. Normally spawn in frozen biomes. They can also spawn on a frozen zombie horse with a stray. The frozen zombie horse is 2x faster than the normal zombie horse, and can step up 2 blocks- can be tamed with frozen flesh obtained from a defeated Frozen.