Vampiric Blow

 is an active skill that that can be learned by Berserkers at level 16 and can be ranked up at later levels.

can be performed with an axe by the Berserker to effectively steal health from the opponent. This skill is useful for self-healing when a healer isn't supporting you. The more targets you hit with this skill (yes, it has a small AoE), the more health you can get.

Like other skills that require charging, gets stronger the longer the player holds down the skill button. Attaining Rank III allows the player to move at half speed while charging. Unlike other charging skills, going into Overcharge for this skill does not damage you, as that would be counter-productive.

Number of times the skill can be charged and the amount of damage dealt both varies dependent on skill rank.

Generally this skill should not be used in rotation, as it charges slowly and has low damage. The skill should only tapped quickly to buff which gets 20% damage boost with right glyph.

Rank table
To upgrade to the next rank, one must find a Tactics 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 berserker 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.)