Here you go.



On the left is the normal attack. The icon on the right denotes a touch-based delivery for the readied spell; the far-right icon, the chain shape, which causes the effects to jump from one target to the next (using the delivery method) until expiration. Basically, you have to touch an opponent, if the opponent is near other opponents (touching them) then the effect spreads. When the effect expires, it can no longer be spread.