UNSTABLE: STOP. Sentry can use Impervious. When this click is revealed, roll a d6 that can't be rerolled. Until you roll for this power again, even if this power is lost, modify Sentry's combat values by the results. This can't be countered or ignored. 1: -1; 2 - 4: 0; 5 - 6: +1

Does the modifier stack each time the stop click is revealed, or does the modifier only last until you roll again? Thank you.

The modifier changes when you roll again,

With official confirmation: http://win.wizkids.com/bb/viewtopic....0eec0d4363c629