A grappled creature is being restrained by another creature, trap, or effect. Grappled creatures cannot move or use their Dodge or Parry. A grappled creature also takes a -2 penalty on all attack rolls and combat maneuver rolls, except those made to grapple or escape a grapple. In addition, grappled creatures can take no action that requires two hands to perform. A grappled character that attempts to use a supernatural power must make a Concentration check (Difficulty 10 + the power's rank) or the power fails to manifest.