Dominate Glyph

Glyphs like Dominate 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.

Dominate

Rare: Barbarian / Druid / Necromancer

Bonus:

For every 5 Willpower (Barb, Necro) / Intelligence (Druid) purchased within range, you deal:
+3% (lvl 1) - 14.5% (lvl 21) (barb, necro)
+7.9% (lvl 1) - 37.87% (lvl 21) (druid)

increased Overpower damage.

Additional Bonus:

Every 30 seconds, your next attack will Overpower. (Barb)
When you Overpower an enemy, all damage they take from you is increased by x15% for 5 seconds. (Druid)
When you Overpower an enemy, all damage they take from you and your Minions is increased by x12% for 5 seconds. (Necro)