The revised version of Anton/Darkside's keyblade. Yes, it's in his actual portrait pic, but I wasn't happy enough with it, so I redid it somewhat. Tenebrex is, of course, a play on the word 'tenebrous' or shadowy.
Tenebrex is a somewhat more literal opposite to Sora's Keyblade... Tenebrex can literally tear a world open, bared to the Darkness. Even if it's already been locked down. Scary, huh? ^.^