When the damage is dealt, this rune with a 5% chance poisons your opponent for 120 lives per turn for 6 moves. The effects are summed up. The number of effects is no more than three. Each "Virtuoso of Blades" medal increases the rune effect by 10.
When the effect is activated, it helps getting a "Virtuoso of Blades III" medal.
You can only get the effect of one rune at a time.
Second such rune will increase the chance of action.