The rotating Stasis Regeneration buff on Europa is buffing the light based abilities.
Update: As you see in the video my melee cool down is 1 min 34 sec with no ads being killed but in the area where Stasis Regeneration buff is active my melee regens in 22 sec.
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Total rubbish I took my titan and tested it. My husband has tested all 3 of his characters and it does not.