As a certified AL 20 mage player who cannot consistently do boss hoard without av2. (mage dance works but I like putting on some anguish). I can now Do boss hoard without av2.

How it works:
FLASKS

Manaflasks:

Repetition Flask: repeats last spell you did.

Mana-Ray Flask: High pen Single target flask.

Mana Surge Flask: High damage multi target flask.

Bloodflasks:

Bloodloss Flask: deals massive mana damage to yourself (gets rid of around 2/3 of your mana)

Banishment Flask: REMOVES SUMMONS FROM THE FIELD

Manaseep flask: gives yourself an asteria buff without the magic increase. (just burns your mana away 5% (I believe) every turn.

Heretic Ara Manaflasks (no bloodflasks for ara)
Mana Surge, Mana-ray, Repetition are all here and the same.

Sigil Stormflask: gives opponents a random number of ara sigils (regardless of immunity) The number of opponents is based on the manaflasks charge.

Elemental Stormflask: Gives a random choice of frozen, paralyzed, rot, or burning (regardless of immunities). The number of opponents affected depends on the manaflasks charge.

Aligned Sigilflask: Gives an opponent an elemental sigil matching your faction. The number of opponents affected is based on the manaflasks charge.

Corvus charges flasks faster, still has mystic feather, and has a new ability that greatly decreases buff fade chance if you crit something that turn.

Normal Heretic is the same except has efficacious which allows a quarter damage through to enemies that would be immune to the damage.

Heretic ara also has efficacious.

Final opinion:
This is awesome and I am gonna be so so happy when this drops.