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Victim's own combat ability is not very high, nor is it related with the "core forces" of the 8th Floor. Instead, Victim can activate a powerful movement restriction skill by sacrificing itself. In using this ability, Victim's main role is that of a powerful one-shot debuff.
It is likely that Victim's role against intruders on the 8th floor revolved around staying alive long enough to kill himself. There is likely a long casting time in activating his special ability. As such, any skills Victim would have should center on self-defense.