Prayer of Peace

 is an active skill that can be taught to Priests at level 36 and can be ranked up at later levels.

can be performed with a staff by the Priest to cancel all aggro on him/herself. This will become very useful in higher levels as the Priest needs to provide heals more and more often to their party, thus generating higher and higher aggro. However, because this skill has a very long cooldown, it should be used only when there are no other alternatives.

It is unclear what the benefits of upgrading this skill are.

Rank table
To obtain and upgrade, one must find a Magic Instructor and pay a certain price of gold dependent on rank.

Glyphs
To glyph, a glyph must be obtained and learned only once. At level 60, a character has 50 glyph points available to spend on all available priest glyphs. Most glyphs, specifically common glyphs can be purchased from a Glyph Master, while fine glyphs must be looted from enemies.

(Disclaimer: As NPC shop prices vary depending on a variety of factors, the prices below are subject to variation. Only take them as benchmarks.)