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School of Fire Magic
School of Earth Magic
Level 1
 Magic Arrow *
 Protection from Fire
Level 2
 Fire Wall
 Visions *
Level 3
 Land Mine
Level 4
 Fire Shield
Level 5
 Summon Fire Elemental
School of Air Magic
School of Earth Magic
School of Water Magic
School:  Fire Magic
Level:  4th
Cost:  16/12
Duration:  1 rnd/sp
 Basic effect
Target allied troop's attack rating is increased by eight against behemoths, dragons, hydras, (firebirds, haspids and couatls) Horn of the Abyss.
 Advanced effect
Same as basic effect, except that attack bonus also affects devils and angels.
 Expert effect
Same as advanced effect, except attack bonus also affects giants (and dreadnoughts) Horn of the Abyss.
 Probability of occurrence (%):
Castle   10
Rampart   10
Tower   16 (10*)
Inferno   10
Necropolis   10
Dungeon   10
Stronghold   0
Fortress   0
Conflux   10
Cove Horn of the Abyss   10
Factory Horn of the Abyss   10
* Without Library

Slayer is a 4th level spell in the School of Fire Magic. It grants the target troop a fixed +8 attack bonus against the specified lvl 7 units, depending on the level of expertise in fire magic.

This spell is the strongest attack-increasing effect in game, except possibly Frenzy but also without its defensive drawback, granting +8 attack, but only against very specific 7th level units, and only ever to a single stack per cast.

Heroes starting with Slayer:

Heroes specialising in Slayer:

Creatures immune to Slayer:

Creatures capable of casting Slayer:

User commentary

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Some may find the information in this section subjective or irrelevant.

Slayer depends on your enemies' army makeup - if you never encounter any valid targets, this spell becomes useless. On the other hand, if you regularly fight dragons or other "monstrous" level 7+ units, it can be a great damage buff, especially in endgame when direct damage spells are less effective than buffs/debuffs due to raw hit points/damage numbers.

Against "valid" targets Slayer is slightly stronger than Bloodlust/Precision, as it grants +8 attack regardless of situation, but it is also more expensive and cannot affect more than 1 stack per cast.

Being 4th level spell, unlike most buffs it can be cast on Green Dragons and Red Dragons.

Fire Magic skill increases Slayer's potential, allowing it to affect wider pool of targets. Typically (without Fire Magic skill) it will only have an effect when fighting Dragons, Hydras and Behemoths. On Advanced level Angels and Devils are also included. Finally with Expert Fire Magic Giants/Titans also suffer increased attacker's strength.

It is costly and inefficient spell, though, with relatively high mana cost and quite specialized effect - always targets 1 stack, only works vs specific targets, requires Fire Magic to achieve its full potential, and if you do have Expert Fire Magic chances are you prefer AoE Berserk anyway to use your enemies' own strength against them or Blinding them one by one.