Where Prodigy relies on breaking between attacks to use the no-cost Primary Skill, Astral Presence is always adding more Arcane Power to your pool, and thus very well suited to continual attacks like the Rays or Arcane Torrent. This Arcane Power generator comes with an enhancement, and is far more suited to prolonged-attack Wizards than Prodigy. Astral Presence: Your maximum Arcane Power increases by 20 and you regain 2 Arcane Power per second. Every Wizard should consider this, but the Arcane Power pool refills so quickly that many Wizards don’t actually need the skill. Relying on Ray spells or Arcane Torrent means spending your Arcane Power consumption gradually, in a way that doesn’t let you whip out your Primary skill in between shots- and so for Wizards that lean on those, this effect is really relatively minor compared to its benefit for a Wizard who alternates Primary Skill attacks with Arcane Orb. While these Wizards will also benefit from Prodigy, unless they have a lot of single-shot high-cost spells (like Meteor), the benefit is going to be mostly going to waste. Many Wizards don’t want to use their Primary Skill if they can help it, and only keep it up long enough to wait for their Arcane Power pool to refill. I’ll add more on that later in another article, but the gist of it is this- if you have a Primary skill that you use regularly and like using, and your other Active skills are very high in Arcane Power cost, you should pick up Prodigy. Prodigy essentially reverses your class mode between a Generator class and a Regenerator class.

Prodigy: When you deal damage with a Primary skill, you regain 4 Arcane Power.

Wizard skill list diablo 3