looks like all classes get the dissident spell/tome its like the upgrade of Dichotomic .. how to get this spell/tome i do not know..
I have the new evolving skill and it's at level 3 currently, It can be bought in Stratos via FIND look for evolving skill merchant.
Virtuous Dusk, the Progressive Spell Merchant, on Find. You can invis safely to the merchant and the spell cost approx 2970 plat.