A mimic can have almost any dimensions, but usually is not more than 10 feet long. A typical mimic has a volume of 150 cubic feet (5 feet by 5 feet by 6 feet) and weighs about 4,500 pounds. Mimics speak Common. ... Mimic. Size/Type:Large Aberration (Shapechanger) Hit Dice:7d8+21 (52 hp) Initiative:+1 Speed:10 ft. (2 squares) 18 more rows