These dice can be rolled in rest phase and you can roll as many dice as you want minus fetique in your cooldown bar. They cant be removed from the active slot unless used. At the end day phase u can get one fetique per exausted poisen die from you AS.  To use you cant be in magicka form and you cannot use it without weapon (magicka weapons dont count). U can use it with only commbat skill but demage from poisen will be dealt to you. You have to deal demage to use this. If you roll a die you have to use it. If you roll miss you drain the die, but if it is Flusk put it into cooldown track. If monster dies, leave it on battle field. It can be picked up by someone, who has alchemy skill line. You get one time use die better with higher enemy level. (1--1, 5--2, 10--3, 20--4, quest--1+2+3+4). After getting this die you have to roll it if it misses you failed at extracting the material. If there is star you lose this die and get special one. All othre times is star just miss. If the potion heals, it doesnt have to do demage and is throwable up to stamina hexes.