Eagle Eye

Secondary Skills
Air Magic
Archery
Armorer
Artillery
Ballistics
Diplomacy
Eagle Eye
Earth Magic
Estates
Fire Magic
First Aid
Intelligence
Interference
Leadership
Learning
Logistics
Luck
Mysticism
Navigation
Necromancy
Offense
Pathfinding
Resistance
Scholar
Scouting
Sorcery
Tactics
Water Magic
Wisdom

Eagle Eye
	Basic Eagle Eye: allows the hero to view an enemy hero’s level 1 – 3 spells in combat. It gives the hero a 40% chance to learn any level 1 – 3 spell from the enemy hero at the start of combat and as soon as a spell is used in combat. It negates one level of an enemy hero’s Eagle Eye skill. gives your hero a 40% chance to learn any 1st or 2nd level spell used in combat.
	Advanced Eagle Eye: allows the hero to view an enemy hero’s level 1 – 4 spells in combat. It gives the hero a 50% chance to learn any level 1 – 4 spell from the enemy hero at the start of combat and as soon as a spell is used in combat. It negates two levels of an enemy hero’s Eagle Eye skill. gives your hero a 50% chance to learn any spell up to 3rd level used in combat.
	Expert Eagle Eye: allows the hero to view all enemy hero’s spells in combat. It gives the hero a 60% chance to learn any level spell from the enemy hero at the start of combat and as soon as a spell is used in combat. It negates an enemy hero’s Eagle Eye skill. gives your hero a 60% chance to learn any spell up to 4th level used in combat.

Spells learned by Eagle Eye are learned before/during after  the fight is won. For a spell to be learned, the hero must have the appropriate level of Wisdom in relation to the spell.

Heroes with Eagle Eye as a starting skill:

•   Ash the Heretic

Heroes with Eagle Eye as a specialty and a starting skill (5% bonus per level to the skill):

•   Sanya the Cleric
•   Malcom the Druid
•   Serena the Wizard
•   Nimbus the Necromancer
•   Geon the Warlock
•   Oris the Battle Mage
•   Tiva the Witch

Related factors:

• Bird of Perception: +5% Eagle Eye
• Stoic Watchman: +10% Eagle Eye
• Emblem of Cognizance: +15% Eagle Eye

Horn of the Abyss 

If two opposing heroes both have Eagle Eye, the following applies:

• Same level of Eagle Eye:
  • Cancelling each other out, neither hero may learn spells from combat
•  Advanced Eagle Eye (2) vs  Basic Eagle Eye (1):
  • 2 - 1 = 1, therefore the hero with Advanced Eagle Eye instead "gains" Basic Eagle Eye, and the hero with Basic Eagle Eye may not learn spells from combat
•  Expert Eagle Eye (3) vs  Basic Eagle Eye (1):
  • 3 - 1 = 2, therefore the hero with Expert Eagle Eye instead "gains" Advanced Eagle Eye, and the hero with Basic Eagle Eye may not learn spells from combat
•  Expert Eagle Eye (3) vs  Advanced Eagle Eye (2):
  • 3 - 2 = 1, therefore the hero with Expert Eagle Eye instead "gains" Basic Eagle Eye, and the hero with Advanced Eagle Eye may not learn spells from combat

Chance to get

Out of total 112 for The Shadow of Death, and of (112 + Interference chance) for Horn of the Abyss .
Banned skills change the probability.

Town	Class	Chance to learn
Castle	Knight	2
Castle	Cleric	6
Rampart	Ranger	2
Rampart	Druid	7
Tower	Alchemist	3
Tower	Wizard	8
Inferno	Demoniac	3
Inferno	Heretic	4
Necropolis	Death Knight	4
Necropolis	Necromancer	7
Dungeon	Overlord	2
Dungeon	Warlock	8
Stronghold	Barbarian	2
Stronghold	Battle Mage	5
Fortress	Beastmaster	1 (lowest)
Fortress	Witch	10 (highest)
Conflux	Planeswalker	2
Conflux	Elementalist	8
Cove	Captain	4
Cove	Navigator	2
Factory	Mercenary	2
Factory	Artificer	4

User Commentary

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Generally, Eagle Eye is considered one of the least desirable secondary skills, as the preferred ones are those which improve units' strength (Archery, Armorer, Offense), help in casting spells (various schools of magic), or make gameplay significantly easier (Diplomacy, Logistics, Tactics). However, it may sometimes help when it's impossible to get a spell from your town's Mage Guild (e.g. Bless in Inferno, or Curse in Castle and Rampart) and you are expecting to fight a battle against another player early on in the game, before you capture their town. For that reason, Eagle Eye is compatible with Scholar. Together with advanced or expert Wisdom, Expert Eagle Eye may be situationally usable for Stronghold and Fortress heroes, as their Mage Guilds are limited to 3rd level, and learning Resurrection and having Advanced Earth Magic could change the whole dynamics of battle.

Part of the criticism behind Eagle Eye is that even with Expert Eagle Eye and all three of the Eagle Eye artifacts equipped, it still can not guarantee learning a spell used in combat, totalling to a 90% effectiveness rate. Other flaws include requiring the battle to be completed before the spells are added into the spell book (i.e. they won't appear there during the battle which could have been really helpful), inability to learn 5th level spells, and inability to learn adventure map spells.

Problem with skills like eagle eye and learning is also with the limit on how many skills can a hero have. Adding eagle eye or learning will make sure, that some of the important skills will be missing, giving enemies an advantage.

However, in HotA  version 1.7.2 the skill was reworked (see above), making it somewhat of a good situational skill.

Things that ruin Eagle Eye

• Starting spells
• Mage Guilds
• Shrines
• Spell Scrolls
• Scholar
• Scholar (Adventure Map)
• Tome of Air
• Tome of Earth
• Tome of Fire
• Tome of Water
• Aurora Borealis

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See also:

• Secondary skills