Hello! Here is a cute l'il doggo... minus both bullets and carnage! (rimshot, please!)

Great question, and we appreciate you reaching out! Within the context of Ethyraia, Heine would not experience nerfing. You're free to have him run around throwing himself in harm's way to your heart's content! He will heal as he does in canon from both superficial and mortal damage.

A caveat: there may be events down the line where this will not always be the case. However, we will communicate that clearly ahead of time so you as a player have time to plan around it!