I - Rules
(see JITD, p. 16, 23)
After inflicting at least 1 damage (before applying the effects of armor) to a figure with a Web attack, place a web token next to that figure. A figure can have more than one web token next to it at a time.
A figure that has been caught in a web is marked with a web token. At the start of each of that figure's turns, its owner must roll a power die for each web token on the figure. For each power surge rolled, one web token is discarded. If any web tokens remain on the figure after rolling, the figure cannot spend any movement points that turn.
II - References
Heroes with the Web ability: none.
Monsters with the Web ability: Bane Spider (master only).
Items granting the Web ability: Falcon's Claw.