Ice Needle

 was an active skill that can be taught to Sorcerers at level 10 and can be ranked up at later levels.

This skill was removed in sorcerer revamp (NA: Spellbound patch, EU Portentous Rebirth) in October 2016. It was replaced with Frost Sphere.

can be performed with a disc by the Sorcerer to deal damage to multiple targets who're lined up. Its slowing component makes it useful for kiting. However, note that the damage dealt decreases as the needle passes through each successive opponent.

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.)