[ Xedra Evolved ] Vampire cure is broken once again (need working suggestions)

[Maleclypse]

Summary

None

Purpose of change

Vampire cure is broken again.

Describe the solution

Make vampire cure work again. (Doesn't currently work)

Describe alternatives you've considered

Testing

Additional context

[SariusSkelrets]

The lilin drain EOC works as intended and changes an effect intensity by refering the current intensity.

      {
        "u_add_effect": "effect_lilin_ruach_drain_side_effects",
        "intensity": { "math": [ "u_effect_intensity('effect_lilin_ruach_drain_side_effects') + 1" ] },
        "duration": [ "72 h", "72 h" ]
      },

Writting the vampire cure code to lower the intensity this way and including a check to remove zero-intensity effects if it doesn't happen on its own is likely to work.