Mages may select 4 spells for their spellbook at first level in addition to Read Magic (5 total spells).
Mages with an Int rating of 16 may cast one additional first level spell per day. Two additional with an Int rating of 17 and three per day with an Int rating of 18. This rule is probationary and is subject to change if the balance of the game is adversly affected.
A critical hit is scored on a roll of 20 on an attack. A critical hit results in double damage. Basic damage is rolled and then all modifiers applied. That total is then doubled.
A roll of a one on an attack results in a critical fumble. The DM will adjudicate the results based on the situation, though the outcome will never be in the player’s favor.