I just tried some stuff in Test Server.
Enchanter:
The new Active skill is spammeable, and has decent damage.
The neutral element looks like Qadal, and other 4 elements like basic elemental spells, such as fire lance, ice spear, etc.
For some reason, Yul damage was ridiculously low, even with 16k+ MATK, I was doing around 200k as much, I do not know if that was because the Server is under maintenance.
Bishop:
I only tested the new Area Attack, it has like 1/4 Nemesis' power, and the heal is lower than Bright Heal.
Assassin:
My Backstab was around 900k, with the new Skill I achieved a 3m Backstab.
Necromancer:
The wraiths can do Critical Hits, and Clean Hits.
I checked adding max Critical, but, the rates and damage did not increased.
I could not check Summoner's, because the server is under maintenance.
*Clean Hits proc more often on High Dex Characters, and the damage increase is around 10% higher than regular hits.
There is plenty things I could not check, because I was kicked out because Maintenance.