Painblast

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

can be performed with a disc by the Sorcerer to deal damage over time to 5 opponents at the same time. Note that the first blast can damage more than 5 opponents (if they are all within the radius of the blast), but only 5 randomly selected opponents would receive the DoT effect. Also note that only the damage of the first blast can be increased with equips; the amount of DoT is fixed.

This still is totally useless in PVE. Poison damage is nice against level 60 monsters and totally useless in level 65. You can sometimes use it to anger group of monsters without using Hail Storm on them.

This skill has various glyphs available and it's almost roll-your-own attack skill. Using glyph to give opponents slowing debuff is far most useful.

Amount of damage dealt 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 sorcerer 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.)