Stalker

Hero quantums can be found in level  9 Arena Chests. Hero is useful in the Arena. Main attributes Evolution Any further upgrades require quantums.
 * The initial level hero evolution is 1 quantum.

Quantums:

A hero's Power is directly proportional to the evolution level. Each quantum received by the hero increases base attributes (Agility, Intelligence, and Strength), thus making the hero more effective in combat.

Base attribute multiplier