[quote]If i kill as hunter with melee stasis.. the invisibility wont turn on..[/quote] Read the helmet's perk's description.

Re-read the description for the Vanishing Execution perk: [quote]Arc, Solar, and Void melee final blows grant invisibility and restore a portion of health and shields. Finishers and final blows against more powerful targets increase the duration of the invisibility and the amount of health and shields restored.[/quote]

Nothing to fix, the helmet says it’s for void, solar, and arc.