Venomous Spider

Heroic Tier
Prerequisite: Ranger, Beast Mastery class feature (spider)
Benefit: Your beast companion gains a +2 bonus to saving throws.
While your beast companion acts independently, it need not move adjacent to you but must remain within 10 squares of you.
In addition, if it hits a creature with a melee basic attack, that creature is slowed until the end of its next turn and takes a -2 penalty to its next attack roll before the end of the creature’s next turn.

Published in Martial Power 2, page(s) 140.