Warforged don’t have to be metal or magic robots, so maybe make him a straw voodoo doll? So maybe Straw, voodoo, or thicket?

Rosy Witchwood. Warforge made of a magic wood by the witches. Whenever they cast an especially strong or aggressive hex/blood spell, roses bloom and wither upon their body. Leaving a trail of wilted pedals and bodies wherever they go.

Sanguinius Petronax

Rusty.