Somatic component

Somatic components are measured and precise hand motions that can be interfered with by wearing armor. This can cause Arcane Spell Failure, resulting in a ruined spell. This means that spells without a Somatic component may be used with disregard to Arcane Spell Failure chance. See: Category:Arcane Spells without a Somatic Component. Note that characters make the same arm gestures for all spells in DDO, so you can't tell which spells require this component by watching your character's animations.