the Elixir exchange tab
Elixir 
is a premium Infinite Hero currency used to substitute Gold, Stone or Wood when upgrading. It is also used for Hero recruitment, tier improvement and unlocking deeper Mining levels.
Elixir may be difficult to obtain in large quantities, but there ways to farm it, including:
- Power Level rewards
- Clearing monster zones
- Daily reward claims
- Clearing Mining tiles
- Elixir Explorations
- Entering bonus Codes
- Event participation
- Premium Event packs
- Exchanging Gems
- Combining a Random or Elixir Warpstone
There is an Achievement based on total Elixir earned.
