Avatar Seamus: Succumb to Darkness

[snord]

Avatar Seamus has:

(0) Succumb to Darkness: This model receives -2 WP and increases its Terrifying Ability by +2. This action is cumulative and lasts until the end of the Encounter. This model cannot perform this action if it would reduce its WP below 1.

Was playing a game today where aSeamus used this twice (over 2 turns, obviously) and so was effectively -4 WP and Terrifying +4.

Then a Witchling Stalker succeeded a cast of:

(1) Dispel Magic: Discard 1 Counter or end 1 effect on target model. Wounds on the model orCounters carried by the model cannot be discarded.

Question: will the dispel magic remove Succumb to Darkness as a whole, cancelling the -4 Wp +4 Terrifying, or will it cancel one "cast" of it making aSeamus -2WP +2 Terrifying?

[Carse]

I would guess 1 cast is removed at a time.

[marshimartian]

I'd have to agree, one at a time, as they're two separate cumulative effects

[Kadeton]

The statement that the effects are cumulative implies to me that there are multiple effects that stack with each other even though they have the same name (the same as having several sources of Armor, for example). Thus, Dispel would remove 1 effect from the stack (bring Seamus back to -2 Wp, +2 Terrifying).

[snord]

Thank you for the opinions. We played as 2 separate instances of the effect, so Dispel removed one at a time, but I was no sure.