GR 70 Trag Necro-No Weapons
I took my Tragoul Necro which has solod to mid-90s, took off my weapons, and switched some jewelry around to make sure I had average damage on them. This got me to 73.5K sheet DPS, which turns out to be plenty to take down a GR 70.
Due to losing a LOT of my cooldown, I did have to fish quite a bit to get good enough maps/mobs/pylons, but I achieved my goal.