Welcome to Wonderful Creatures Squared; this mod adds (for now) 3 new creatures that can be found in various locations

Soul Strider

Is this the Soul Strider that can be... crafted?
You can use this new recipe at the potion bench to make souls

You can also get 64 souls just by killing the Warden.

You can use the souls to make a gargoyle.

And if you activate any redstone on the gargoyle, it will transform into a Soul Strider (which can be tamed with souls).

Wooden Golen

They are rarely found wandering through forest biomes, can be bred using seeds, and may drop their horns—and very rarely their hearts—upon death

which can be used to craft the newest wooden staff that shoots arrows marking the monsters

Mandrake

Mandrakes are creatures that spawn only in the End; they HATE players and will attack them at all costs. Killing a Mandrake yields a Twsited Onion, which inflicts Slowness