Rules
Resistances
If you have resistance, divide damage by 2. If you have weakness, multiply damage by 2. If you have Immunity, take no damage.
Advantage
If you have advantage, roll twice and take the best roll. If you have disadvantage, roll twice and pick the worst roll.
Initiative
Roll the d20 whenever rolling for initiative. Improved initiative only activates when rolling in combat. Whoever goes rolls the highest goes first.
Attack Rolls
You need to roll these stats to make the associated attack: melee - thac0, ranged - thac0 and dex, magic - wis. To hit a melee attack you need to roll your thac0 minus your targets ac.
Stat Rolls
When rolling either strength, dexterity, constitution, intelligence, wisdom, or charisma, you need to role on or under your ability in that stat.
Melee Combat
Roll the following dice when doing a melee attack for damage: 1-4 d4, 5-6 d6, 7-8 d8, 9-10 d10, 11-15 d12, 16-20 d20. If you are unarmed, divide your strength by 2 when determining your damage dice.
Rogue Skills
Rogue Skills start at a 3% chance and increase by 5% each level if used, 3% if not. All rogue skills cap out at 100% by default.
Mana Limits
You may use 5 times your maximum mana capacity in one day. Exceeding this limit has a cumulative 25% chance for you to pass out for every maximum amount of mana used.