Battle Magic

From Heroes of Might and Magic: Olden Era Official Wiki
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Battle Magic is a skill that lets the hero's Spell Power and Knowledge stats increase the power of their army.

Levels

Basic Battle Magic
Friendly creatures’ Attack and Defense increase by 15% of the hero’s Spell Power and Knowledge respectively.
Advanced Battle Magic
Friendly creatures’ Attack and Defense increase by 20% of the hero’s Spell Power and Knowledge respectively.
Aura of Destruction
Every time the hero uses a spell in a battle, their Attack increases by 1 until the end of that battle.
Aura of Protection
Every time the hero uses a spell in a battle, their Defense increases by 1 until the end of that battle.
Aura of Wizardry
Every time the hero uses a spell in a battle, their Spell Power increases by 1 until the end of that battle.
Expert Battle Magic
Friendly creatures’ Attack and Defense increase by 25% of the hero’s Spell Power and Knowledge respectively.
Battle Mage's Authority
Friendly creatures’ Attack increases by 15% of the hero’s Spell Power. This bonus is doubled if the hero knows “Sorcery”.
Mage Protector's Authority
Friendly creatures’ Defense increases by 15% of the hero’s Knowledge. This bonus is doubled if the hero knows “Resistance”.
Magic Time
The cooldowns of all the hero’s battle spells are reduced by 1 round(s).

Skill Synergies

Knowing Battle Magic will give the following benefits to other sub-skills:

Chaos Reigns
The hero and friendly creatures deal 50% more Damage with Lucky Strikes. This bonus is doubled if the hero knows “Battle Magic.”
Battle Focus
Generates +1 Focus Charge(s) at the beginning of each round, except the first. This bonus is doubled if the hero knows “Battle Magic.”
Expert Battlecraft Battle Focus

Generates +1 Focus Charge(s) at the beginning of each round. This bonus is doubled if the Hero knows Battle Magic.

Expert Primal Magic Chaos Reigns

The hero and friendly creatures deal 50% more Damage with Lucky Strikes. This bonus is doubled if the Hero knows Battle Magic.

Artifact Effects

Holy Sigil of Eridore  — Epic Relic
While worn, grants all unlearned Subskills of the following Skills: Logistics, Battle Magic, Wisdom.
  • Holy Sigil of Eridore grants all unlearned Battle Magic subskills, as well as those of Logistics and Wisdom.