As an artificer you acquire bonuses to UMD which compensate for your -CHR you endure for getting a warforged. Additionally, should you have any metamagic feats, they can be placed on scrolls, wands, etcetera that you utilize even though in battle or from combat. For your juggernaut, get the Guardian https://laneaqevj.shotblogs.com/examine-this-report-on-what-is-eberron-42170358