Modified mammoth:
Mammoth: Slam 2d8, stamps 2d6, gore 2d8, trample 2d8
Bigger head/trunk to batter mobs around. Legs are decent for stamp. Downward tusks makes gore difficult and they don't look anywhere near as massive as an elephants. Trample is the same. It's a big 5 -7 ton monster, it's gonna hurt!