Do you need to have a regen bracelet to make a tormented bracelet?
No, you do not. However, to make an uncut zenyte you will need to have a cut onyx. You have to combine this onyx with a zenyte shard. The tormented bracelet and the regen bracelet have another item in common. You need a gold bar too for them.  So no, you do not need a regen bracelet to make the tormented bracelet, but there are a couple of similar materials needed.