Detach
To Detach is to send an Xyz Material attached to an Xyz Monster to the Graveyard. Often, this must be done in order to activate the effect of the Xyz Monster, though it can also be done as a cost for certain other cards or as part of an effect.
Since Xyz Materials are not considered to be on the field in the OCG, effects which activate when a monster is sent from the field to the Graveyard do not activate. The TCG now follows this rule as well [1] though it previously followed a rule that the Xyz Materials were on the field.
Currently, Xyz Materials cannot be reattached to Xyz Monsters once they have been detached, except through the anime effect of "Number 19: Freezerdon", which was changed upon its release. Cards such as "Xyz Reborn" can attach other cards to Xyz Monsters as Materials after their Summoning.
