Effects that expire after one use?

[Newawd]

For the life of me, I can't figure out how to make a DMG:1d6 that expires immediately after the first time it is added to a damage roll. Is such a thing possible?

Thanks in advance

[Trenloe]

Check the "Other Attribute" entry under "Effects" in the 4E User Guide (accessed from the library link at the top of this page).

This explains the various coloured buttons the GM has access to in the combat tracker next to an effect.

Press the "ALL" button once so that it shows "ONE"

This is the "Once" entry:

Once: If any effect component is applied, then the effect expires.