Transmutation - What have you been coming out with, what combination?

[Welsper59]

It's random, like practically everything in the game. It seems like the only influences are the tiers of materia that you put in (obviously). The more of a specific tier materia you put in, the more likely you'll get something of that sort.

By example: 5x t3 materia = ~95% chance of t3 materia being returned. The remainder can be either a t4 or a downgrade to t2/1. Whereas 2x t3, 2x t1, 1x t2 materia = ~35% t3, ~35% t1, ~18% t2, remainder is whatever. Obviously my percentages aren't going to be accurate, but it gives the idea.

The type is 100% random and seems to have no affecting influence, as far as I've tried/heard. Resist materia have yielded combat/secondary/gathering/crafting/resist materia. Likewise for those types yielding the same. As far as anyone knows, t5 materia has not been introduced yet, so there's no way to upgrade when using t4 materia.