Tenacity (Berserker)

 is an active skill that can be learned by Berserkers at level 20 and can be ranked up.

can be performed with an axe by the Berserker simply to get mana. This skill can briefly boost your mana while out of combat (ie. useful to cast this right before entering combat) and during long fights, making it quite similar to.

The amount of mana recovered is dependent on skill rank.

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.)