Crones and other questions

[Fgehjss]

Hello,

I am an old Rohan-player with the memory of a goldfish apparently since I forgot almost everything.
I have a few questions:

1. Is Templar any good?
2. Can I trade anything from the Item Mall for crones?
3. What is currently the best PvP-class?
4. When they update the game, do they change the current meta a lot or don't they swing the nerfhammer as much as in other games?

With kind regards,

MrMango