Today we have several skills that provide a counterpart to other skills. They may be part of a cycle, or may be just a counter, but either way, it's their relationship to other skills that define them. Remove Trap is the counter to all those trap skills, known and yet to come; Command and Ranged Commander comprise a small cycle of their own; Armor of Grace is the complement to all those spiritual damage skills there's little defense against; and Immolation is the mage's answer to Lightning.