In your experience with toxins, you always have a little something on hand to make your attack venomous.

Encounter ✦     Poison
Standard Action  

Special: In addition to the keyword above, this power is considered to have the same keywords and range as the at-will power you use with it.

Target: One creature

Effect: Use a melee or ranged at-will attack power. If you deal typed damage, you can change that damage type to poison. If you hit, you also deal ongoing 5 poison damage (save ends).
11th Level: If you hit, you also deal ongoing 10 poison damage (save ends).

Published in Dragon Magazine 373, page(s) 16.