Because you have an Atma, not an Animus.
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That's weird, I could have sworn I saw a level 90 Yoshimitsu glowing in combat...why do other level 90 relics glow in combat and not this one?
That's because it's an i100 relic.
zenith - i90 relic with glow
atma - reskinned i100 relic with i90 stats (before books) without glow
animus - The atma with real i100 stats and glow
Ah ok thanks for the info...I never saw my weapon glow at all then because I turned in my atmas for the Yoshimitsu as soon as I received it! Thanks again!!