[Auraleus]

xdy = roll x amount of y sided dice
1d4 = 1-4 damage
3d6 = 3-18 damage
etc

THAC0 = To hit armor class 0
if THAC0 = 10 and the enemies ac = 5, then
10-5=5, so you would need to roll a 5 or higher to hit the enemy
low THAC0=good

you can turn rolls on in the game options menu if you want to see whats going on besides damage