As a new endgame system to play with, one that will augment and power-up existing builds - it sounds awesome.

Like hundreds of Forgotten Souls and Deaths Breaths and Bounty Rewards. It's very detailed, and unlocking all Seals will take quite a bit of materials.

Potion AA, 'When you drink your health potion, you manifest one of three runic circles on the ground that grant increased damage, increased cooldown reduction, or increased resource cost reduction.' Potion AB, 'When you drink your health potion, all enemies within 25 yards deal 25% less damage.' Potion AC, 'When you drink your health potion, gain a random shrine or pylon effect.' The three Legendary Potion Powers sound awesome too. 'Once a Seal or Legendary Potion Power is unlocked, you’ll immediately receive that Seal or Potion’s power and will have the ability to unlock connected Seals or Potions once you have the required materials.' 'The order in which you unlock additional Seals and obtain their powers is entirely up to you and which powers align with your character’s build the most,' Blizzard writes.

Diablo 3 season 20 start time