Mage · Arcane · tier 4 · from level 25 · needs 5 points in Arcane Concentration

Arcane Meditation

Rank 3/3

Allows 50% of your Mana regeneration to continue while casting.

Doesn't change the damage or healing of any Mage spell.

Averages, counting crits and misses, for a level 60 Mage with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.