For easiest leveling, play as agi battle character. Once you hit priest, you can heal an entire party with Sanctuary and SP Recovery lv 10, even with low int. When you hit lv 99 high priest, reset to fs build (int/vit/dex).
Reset at Hypnotist at prontera, go for agi/dex and a strong mace. Get 25 dex asap, then build 70 agi. Get a few points in int for sp recov and vit for status resist. Max Heal, Bless, AGI first. After you get priest, get SP Recovery 10, Sanctuary, and Magnificat. You could take spiritual thrift too to save more sp, and with sp recov lv 10 and magnificat, you will never run out of sp, and likely won't need more than 20 int even in parties as long as you heal mostly with sanctuary (this does take a bit of skill), but I'd take some sp items if you have to heal spam for some reason. Also, buy a healing staff for turn ins - you won't be meleeing there.
The best part about the build is that it can solo competently, and you'll want to focus on undead/shadow to use aspersio with. Glast heim abbey and graveyard are great.
Regular Priest skill build : http://irowiki.org/~...dAhEcFmn1qEbNak
High Priest : http://irowiki.org/~...cCkNsNqEbN1cFJy
You can continue to AB as battle build, but it dramatically drops in effectiveness after 3rd class -- you simply need aoe, which battle ab doesn't have. That being said, battle priest/high priest are both a lot of fun and don't require a lot of investment, but if you have money to spend it will make it much faster.
Edited by Karusan, 16 July 2014 - 06:30 PM.