Hmm...
30th-level minotaur barbarian, demigod, Strength 30, uses a mordenkrad +6 (2d8 brutal 1). Use a 29th-level daily for rage strike... 18d8 brutal 1 +16, so average 106 damage on a hit, or 53 on a miss, or average 181 on a crit... and this is all before feats and other magic items. Yeouch...