First and second slot can only hold "Vs. Family" Evolith, third slot is "Magic" (Casting time, Enmity-/+, etc etc).
Fire allows you to put "Ranged attack or attack"
Thunder is Acc/R.acc
The Shape decides what "Type" (as stated above, Closed Triangle = Vs.Family) and the Element decides what type of buff, though it changes from Shape to Shape.
I just don't see any of this senergy gear as being very useful except as merit party gear. In a game where you have a max of 320 gear slots making us have to carry more ex gear is not what is needed for the ffxi community.
Over all that's a nice look'n body pice, i want one just for the looks.
and i guess this Synergy thing is more for makeing gear to aim at sertant monsters, who know's >.> might find something to make them Imps "funner" *Resist Animisa* that +7 attck to Brd's would .. er Might help in G-Colibri Merit camps =3