Concealment

When a creature has Concealment, it's exact location is obscured (usually by illusion magics or similar effects) but not physically blocked. A Concealed creature gains a defensive bonus, in the form of a chance for all attacks to miss them. This miss chance comes in two amounts, representing how concealed the creature is - 20% (Blur) and 50% (Displacement, Invisibility). To calculate whether an attack misses or not due to concealment, an Attack Roll is made as normal, and if that attack hits, a d100 is rolled. If the roll on the d100 Concealment check is lower than the creature’s concealment, the attack misses.