Ideas: Sentinel instead of GWM. Should they attack you, you can obtain drawback via your metal defender reaction. Whenever they attack the defender, you will get to attack via your reaction. As an artificer you obtain bonuses to UMD which compensate to the -CHR you suffer for staying a warforged. https://spencerztliz.newsbloger.com/28546457/the-smart-trick-of-fierna-tiefling-5e-that-nobody-is-discussing