GMST Class Testing

Making an I/L here. I'll be glad to test Chain Lightning and Big Bang, and some of the DoT stuff...once I do my 4th job advancement. Working on 3rd right now.

As an I/L, I would generally give a big thumbs up to whoever can direct me in the best placement of SP in my skills and to show me that mages are finally on par with other classes in bossing. However, the two ice DoTs we get are not nearly as interesting as the mix-and-match stacking of F/P DoTs. Also, as clarification, are skills' DoTs stackable based on skill or based on element? And I have no idea how you may manage to lay your hands upon a elemental weapon (CWKPQ perhaps) but the effect of those weapons on DoT and summon damage has been a question around for a bit.