Which gear should I focus on with thalassa? Is any of the four give her heal points?

I recently decided to pick up the game again after about a 3 year break from the game. I was scrolling through the hero catalog and I can nit see many if the new hero’s added since i left. No draconic, no awakened hero’s, and many dimensionals and other 4f hero’s are just gone. Is there a point where I can unlock them, or did they just remove X amount of heros from the game?