Tactician Glyph

Glyphs like Tactician Glyph can be placed into Paragon Boards to add bonuses to your skills. These are stored virtually and not in your inventory and can be levelled up to further improve them.

The Glyph Guide has all the details.

Tactician

Rare: Sorcerer

Bonus:

Grants + 25% (lvl 1) - 125% (lvl 21) bonus to all Rare nodes within range.

Additional Bonus:

You deal x 10% increased damage for 4 seconds after casting a Defensive Skill. This duration increases by 4 seconds for each Defensive Skill not on your Action Bar.

Requirements: 25 Dexterity (in radius range)