CHAMPION SKILLS: Divine Herald/Legendary Warrior/Tyrant King: Can no longer be selected by heroes that are not the Champion Ruler type.

Ascension Patch 4.20: Advent of the Ultimate Champion is now out!

Presenting key new features:

CHAMPION: Instead of having massively inflated stats, the Champion Ruler may now select 1 of 3 Legendary Skills at the start of the game (it cannot be respecced). These skills act as different paths a Champion can take to focus on either Economy, Combat Power or Support Skills. The effects these skills provide include:
Tyrant King: Grants the Tyrant's Will ability, a 6 range, once/combat free action ability that restores the action points of target unit. This effect jumps to up to 2 additional targets.
Divine Herald: Grants the Champion's Throne City +30 Imperium and +30 Stability income.
Legendary Warrior: Grants the Champion +30 HP, +3/+3 DEF/RES, the Piercing Property (Ignores 50% of target's DEF) and a +50% DMG modifier.

Unit Rebalancing:

Transmuter: Shift Bolt Damage: 23 -> 20
Transmuter: Now has Piercing
Transmuter: Petrify now has a completely new effect: it deals 36 damage and saps the action points of the target. This effect jumps to up to 2 additional targets. This ability has the DEBUFF tag, making it unable to benefit from damage modifiers, but it ignores 50% of the targets' defense.

Zephyr Archer: Zephyr Shot: is now a base attack. (Benefits from armor piercing, star blades etc)

Tome/Spell Rebalancing:

Tome of Artificing:
Artisan Armaments (The +50% Crit Enchantment in Tome of Artificing): Now also affects Ranged and Battle Mage type units. ( @Bekons )
Siege Magic: 20% -> 30% DMG for Battle Mages

Mystic:
Scroll of Enchantment (Mystic): Now affects Ranged units.( @Nadash )

Tome of Enchantment:
Awakened Tools: Tooltip Fixed

Tome of Pandemonium:
Havoc Magic: 30% -> 90% debuff proc chance