Amazon have detailed the compensation all players will be receiving due to yesterday’s almost full-day maintenance, and there’s quite a lot in there.

Compensation (Source)

Heroes of Arkesia,

Due to the extended downtime and multiple delays that occurred when implementing the September 7th Update, players will receive a compensation package.

The following items will be delivered to all players who login between now and 12 AM PT / 7 AM UTC on September 16th:

Crystalline Aura 5 Day x1

Aura of Resonance Recovery Elixir (14 days) x2

3 Battle Items Chest x3

Una’s Tasks [Daily] +1 x3

Pheon x20

Growth Support Pack

Destruction Stone Selection Pouch x5

Guardian Stone Selection Pouch x12

Honing Shard Selection Chest x10

Remember that your Aura of Resonance Recovery Elixir must be used within 14 days of when it’s claimed!

We hope this helps make up for the time in which heroes were unable to explore Arkesia, and we thank you for your patience surrounding the situation.