Ishara's Lullaby

 is an active skill that can be taught to Priests at level 14 and can be ranked up at later levels.

can be performed with a staff by the Priest to put an enemy to sleep. In this period of time, party members can rest up, take pots, get rebuffed, get healed, get resurrected, etc. The downside is that this skill has a relatively high chance to fail when used on BAMs and bosses, and also has a long cooldown.

Duration of effect varies dependent on skill rank.

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.)