Thread:Theundeadlord/@comment-16107481-20171217152038/@comment-16107481-20171222205151

Attach materials including a specific monster (much like a Tuner for Synchros) to the Summoned monster like Xyz Monsters, and like Synchros, their Level must sum up to the Rank of the monster you are Summoning.

e.g. Level 3 ??? monster + Level 4 monster ==> (attaching to) Rank 7 Extasy.