I have try
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Highlander - I think this one is the easiest. Pretty tanky without any CON and has super high damage output.
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Pyromancer - Have some problem with flying unit but can solo boss easily. C1 is a bit weak but C2 Pyromancer with lv 10 fireball can destroy everything in a few seconds.
I also try full SPR archer. It is not a click for me. Soloing boss is very hard and time consuming. Mana problem is much bigger than Pyromancer because AoE is terrible and I have to spam oblique shot instead which make me sit every few minutes even I go full SPR.
I want to try another class with easy leveling. Can anyone suggest me?