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Yes guardians. You get a Z character and two unions equipment.
Another vote for guardian pact. But if you already have a good amount of Z, I think saving for when more Zs like doll girls are added into the pact is also a good idea. Chainable Area-1 Tera skill is super useful both in battle and in SBing.
Thanks guys. I think I will save it after all. I really want Djagos and figured odds would be better to pull her before the pool increases, but then again I'll probably end up with another I don't really care for. Already have Chirol.