Attacking, to hit: Roll d20 vs target AC. No ability bonus to attacks.
Damage: Roll weapon damage + Strength bonus. Apply armor DR after any save reductions.
A roll with a 1d20 rolls a natural 20 (critical roll) it's an automatic hit, ignores DR and is two times (x 2) damage.
Reach: Spears, polearms, and long weapons may strike from the second rank or over allies.