From LSWiki

Class: Combat Skills
Attribute: Perception
Pedagogy: Physical Training
Practitioner Term: Killer

This skill represents one's trained or inborn conditioning to go straight for the kill in combat, striking hard and fast at the
most vulnerable point without flinching or holding back, and without indulging any notions of fair play.  It improves the damage
and accuracy of one's combat maneuvers.

Development Information: The killer instinct skill was created by Chaos and is maintained by Lost Souls; the source code was last
updated Thu Mar 03 02:17:54 2016.

Notes

• Increases capacity for emotive energy
• Decreases capacity for intellectual energy

Trainers

Avalon: Bercilak
Skarlan: Badlokk
Obsidia: Goth
Shadow Tower: Boko
Association required:
Kazarak/Kazarzeth: Urdo Wanders
Maidens of the Spear:  Sulin
Sodality of the Nine-Spoked Wheel: Grendal
Guild required:
Aisenshi: Musashi
Battleragers: Borulien
Brute Squad: Fezzik
Coven: Lynda Xenetha
Hawkmen: Katar
Justicars of Axa: Edwin
Hantaka: Hasan Wanders
Ordo Ignis Aeternis: Iklam wanders
Reapers: Holton Jax
Verynvelyrae: Sirinil
Quest required