Champion Level

Champions start at level 1 and raise it by gaining experience. Each level provides perks to the Champion and to the Troops of the same faction.

Experience
Each Champion starts with 0 Experience (XP). Additional XP is acquired by following means:
 * completing Missions (except Tutorials) awards XP to each hired Champion, even if he dies
 * training individual Champions in the "Manage Champions" menu

The required XP to level up increases for each level. However the formula is not uniform. The growth of the requirements is divided into 4 tiers. Each tier raises the "growth of the growth" for XP required to level up higher than the previous tier. This slows the speed at which Champions make progress through the levels.

Formulas:

Here are the values for level up to 50:

Perks
Each level (including the starting one) provides following bonuses to Champion Stats (rounded down):
 * +1 Hitpoint
 * +0.1 Attack damage
 * +0.1 Defense damage
 * +0.1 Regeneration
 * +0.1 Armor
 * +0.02 Healing

Each level (including the starting one) grants 3 Talent points to Champion be spent on Talents.

Health Bonus
During a mission each level (including the starting one) of a Champion on the battlefield grants bonus of 0.25% to Maximum Hitpoints to newly recruited Troops of the same faction.

Clarification:
 * The bonus DOES NOT apply to other Champions.
 * The bonus DOES NOT apply to Troops of other factions (color).
 * The received bonus of a unit is computed only ONCE at the time of their recruitment and doesn't change afterwards and ONLY from the levels of Champions alive at that time. This means that Troops don't gain the bonus when recruiting a new Champion and don't lose the bonus when a Champion dies.