The Training Staff is an item that is craftable in the Engender Mod.
Crafting[]

In order to make a Training Staff, the player needs two Blaze Rods and a Zombie Head, and they need to place them as seen in the picture in a Crafting Table.
Usage[]
Right clicking with a Training Staff in hand will cause any allied Engender mobs to train by fighting one another. Mobs in training will take damage, but cannot die, and will be brought back up to full health if defeated in training, which is a good way to have Engender mobs gain experience and level up without putting them at risk in actual combat against wild mobs. Shift right clicking with the same Training Staff will cause all mobs to stop training.