Priest Skills, Level 23 - 40
Grand Cross is your level 23 skill, 10 SP to learn, 4 to upgrade. The skill requires Paralyze Bolt level 5. It's a very slow skill, but very powerful. You slash the air twice with your wand in an X pattern, and the resulting holy cross flies forward slowly, damaging and knocking around enemies. Just be careful, because you can aim it anywhere, and if you aim incorrectly, you can send it flying right into the ground at your feet, or into the air above the enemies' heads.
Healing Relic is the other level 23 skill, requires level 3 Aura of Healing and Lightning Relic. It is 10 SP to learn, 4 to Upgrade, as usual. Same deal with a cross dropping from the sky, except this one drops closer to you and has a weaker enemy slam. It also doesn't deal damage but, instead, radiates waves of healing. After 4 waves of healing, it disappears. The healing depends on both a fixed number relating to skill level and a percent of your magic damage. The skill is useful for keeping allies alive in mobs of strong enemies.
Blessing of Strikes is level 26, requires level 2 Protection Shell, costs 10 SP to learn and 4 to level. Another buff, all it does is increase party damage by a percent. Very useful to have.
Detonate is level 26, requires level 3 Chain Lightning, 10 SP to learn, and 4 to level. Once you use it, every enemy nearby that's electrocuted has that electrocution dispelled, but they also explode. Given how many of your skills electrocute things, it's fairly useful to blow up a mob after your combo is running down.
Cure Relic is level 29 and needs rank 3 Healing Relic. 10 SP to leanr, 4 to level. Yet another relic, only this one increases Light attack of allies and removes debuffs on them.
Vengeance Wave is level 29, 8 SP to learn, 3 to level. It's a passive that allows you to click while being attacked to blast enemies away from you. This is useful as prevention from being juggled or stunned.
Holy Burst is level 32 and requires Grand Cross level 4. 10 SP to learn, 4 to level. One of the flashiest priest skills, it has a large AoE centered around you, and rains the area with holy lasers from the sky. High damage, good AoE, and only a 40 second cooldown.
Bind Relic is level 32, needs 1 Cure Relic, 10 SP to learn, 4 to level. Yet another relic (Saints love relics) that shoots out waves similar to Paralyze Bolt, binding enemies in place and leaving them at your mercy.
First Aid is level 35, 10 SP to learn, 4 to level. It's a passive that grands you a chance on being attacked to strike back with magic damage and heal yourself for a percent of your HP.
Heavenly Judgement is level 40 and requires level 5 Detonate. It costs 10 SP and only has one rank. It's a huge AoE with ridiculously high damage raining lightning bolts down on the battlefield. It has a 2 minute cooldown, so it's not spammable. It's, however, definitely powerful.
Miracle Relic is also level 40 and requires level 3 Bind Relic. Also 10 SP to learn. On a crazy 3.5 minute cooldown, it calls down a large relic that, well, does everything. It radiates huge amounts of damage, reduces damage taken by 70%, and cures debuffs on allies in range. Unfortunately, it only lasts for 13 seconds.