I almost forgot. Everain is +2 enchanted. Flawless is non-enchanted. Certain enemies in the game require weapons of certain levels of enchantment before they can be hurt, else you will just get the "Target is immuned to your weapon" message.
Your basic weapon has 3 main variables.
Enchantment is usually not written in the description, but implied by the weapon's name. This is important, because later on, you will encounter enemies that are immuned to all weapons except those of +4 enchantment and above.
In addition, Bows/Slings/Crossbows do not determine your weapon enchantment level, the
AMMUNITION does.
THAC0 stands for "To Hit AC 0". It basically determines how well you can hit a target. The lower the THAC0, the better.
Formula: THAC0 - AC = Number to beat on a 1d20
A roll of 1 on the 1d20 is always a Critical Miss, while a roll of 20 is always a Critical Hit.
Calculating base damage is a simple enough affair.
For Flawless,
1d10 damage, therefore ( 1 + 10 ) / 2 = 5.5
For Everain,
2d4 + 2 damage, therefore ((( 1 + 4 ) / 2 ) * 2 ) + 2 = 7