Might is a measure of how strong your character is. It is one of three character Statistics, along with Will and Grace. It can be increased by Selling Experience at Level 89, and can reach a maximum of 130. Some weapons require a certain Level of Might to be wielded.
For every 5 points of Might, you do 1 damage point against 0 AC. If you have 130 Might, you do 26 damage points against 0 AC. This base calculation is used in conjunction with multipliers such as weapons, Damage, and fury spells.