In your personal Eberron, as you control it, can a Warforged sprout an aberrant dragonmark? If so, is it just possible in theory or has it happened? (You may have answered this elsewhere, but I couldn’t find it)(also, big fan of the plane!) Sure. Mechanically it’s possible, and in my novel The Son of Khyber there’s a warforged with an aberrant mark. But this is EXTREMELY WEIRD and rare, and people would be very surprised by it; such a character would draw a lot of attention.
— Keith Baker (@HellcowKeith) January 8, 2019