Concealment

Concealment is something that prevents an attacker from clearly seeing his or her target. Concealment creates a chance that an otherwise successful attack misses (a miss chance).

Self-Concealment feats, Monk's Empty body ability and spells Displacement, Invisibility, Greater, Ghostly Visage, Ethereal Visage and Darkness all provide the PC with opportunities to have concealment.

Calculating Concealment miss chance
25% (or lower) - Only 1 attack MAY miss out of 4 to 6 melee/range attacks.

30% to 40% - Opponent MAY miss between 1 to 3 attacks out of 4 to 6 melee/range attacks.

50% - Only 2 to 3 attacks MAY miss out of 4 to 6 melee/range attacks.

The higher the percentage the more likely that attack will miss. Also the number of attacks that will miss depends on certain factors such as haste or flurry of blows. Blind Fight reduces the chance a character will miss.