From Edge of Darkness Wiki
Slayer
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Mages know the risks involved when they decide to conjure up entities from other planes of existence, yet they continue to do so. Each time a summoner botches a casting or allows an entity into the material realm as part of a pact, someone has to clean up the mess. Usually, nearby cabals are up to the task and if not, the Consilium is. In cities where the problem of summoned creatures gone amuck is a frequent occurrence, the Consilium may take to training slayers specifically to deal with the threat. A slayer receives intensive training on how to combat otherworldly menaces and their negligent masters if necessary. Every slayer is already an accomplished combatant in his own right before the training begins; a mage that has learned how to effectively combine magic and brute physical force. Training a slayer takes upwards of a year, during which time the character learns a large amount of summoning lore, allowing him to identify weaknesses in the things he will fight.
When confronted with an alien threat, if the character spends one turn observing the entity he can attempt to determine where the thing came from and how best to fight it by rolling
Intelligence +
Occult. Each success reduces the entity’s Defense by one for any attacks made or directed by the character. With an exceptional success, the character remembers exactly what kinds of weapons are best used to combat the entity, as well.