This is the standard ritual magic tech we're working with right now:
Collaboration (X MP/TP) - If a caster doesn't want to pay the full MP/TP cost of a spell (either from preference or need), he can enlist other mages who will split the MP cost with him, usually equally but not necessarily. For the purposes of damage or MATK, roll using the stats of the caster with the highest total ritual or ...
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