DK's dont have death gate in their spell book or from the trainer and the enchantment vendor doesn't sell runeforges. The problem here is that you can't apply runeforges unless you're physically at a runeforge (even on the tournament realm) and the only one that exists in the game normally is in Ebon Hold and DK's can't get there on ATR.

Are DK's stuck using regular enchants or is this an oversight?