Aptitude for Slaughter (Tools) (殺戮技巧（道具）, Satsuriku Gikō (Dōgu)?, localized as "Art of Massacre"EXT) is a Skill possessed by Heroic Spirits fitting the Assassin or Berserker classes. Implements used gain a plus modifier in their damage dealt against humans.[1]
| Rank | User(s) |
|---|---|
| A | Archimedes |
| A condition that Archimedes has even though he doesn't want it. It is like a sort of curse.[1] |
| Servant Skills |
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