About leveling:
Start with 1 Phoenix Valley run (don't die), you should get
enough coins and spirit to buy most important skills.
Then ask someone to reset you, do another PV run,
buy most of other skills, and after third run you should
have all your skills maxed, be around lvl 130 (probably still below)
and it should all fit into 2 hours.
Next day do your 1st fairy (Sage or Demon culti), start visiting
Auctioneer regularly for cheaper Skill Books, and start farming
Chrono Leaves (OHT - Unicorn Forest), and Chrono Sand
(OHT - Moonshade Desert). For full 130 set with single weapon
you need 88 of each. Every additiona weapon will require 8 more of each.
God's Giving NPC (Enhance section) sell Dragon Orb Flame (consumable)
for 100% successful refining.
(Short NPC with wide umbrella hat, usually near Teleporters.)
Same Enhance at GG sell some shards (stones) for sockets.
Another type of stones you can find in EPW Donation Helpers forge.
They cost 1 Pure God Stone each. Pure God you get after Prison Quest in
FC (Frostcovered City), or you can buy from catshops...
While farming you will gain your lvl 130, if you don't have it already.
You will probably decide to get your 130 gear first, and then to do Culti.
As you can see, if all goes well, you are Sage or Demon at lvl 130
in 130 gear in 2 days, playing around 2 hours each day.
Ok, later gets slower, but you will just need more days.

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About class:
Maybe Mystic? But only if you prefer strategic play over brute force.
Mystic is much more mind that muscles. I plan to make one soon.
Pet (summon) to tank and add some damage, plants to spam and debuff...
For now I have just Seeker and Cleric, both Sage, and I like them both.
I like TW, but on this server didn't have any yet. Only on PWI (RT).
Otherwise I'm purely PvE oriented.
My Cleric is AA build, have lot of mage stat points and high mdef.
Also hits very hard and heals very good. Pdef I compensate with necklace,
belt and pdef stones. Less HP but slower to lose it and faster to heal.
Problem is with some of the Event bosses, they 1-shot any AA build with AoE.
But, on the other hand, high heal allow me to increase survivability of GV squad,
and survive there in lvl 130 gear pretty well. I just need tofinish 1 piece of my
Demonic armor (lvl 140) to start wearing it.
(Each piece of Demonic armor requires 220 Epic Coin to forge Demonic Armor Token.
Demonic Accessory Token requires 280 EC each, Demonic Weapon 300.)
If you know how Psy or Sin pwn (maybe to google about it?), you can make one.
