Rogue + Thief +
Circlet of Fire +
Scroll of Heat Metal = 2d8 on first turn ...
And 3x 2d8 (once per each bonus action) for every subsequent turn with guaranted hit ... and you still can add your main hand attack, prefferably sneak attack if possible. :3
That means (1d8 + Dex mod + 2d6) + 6d8 ... 68 + Dex mod damage potential per round, if you are wearing Rapier.
