From Destinypedia, the Destiny wiki
A Splicer Shank is a SIVA-infused variant of the standard Shank. They come in the same varieties that have been seen already. They fire red-colored Solar-based weaponry, a modification caused by the technovirus.
Splicer Shanks fire their weaponry a lot faster than they normally do. They aggressively swarm the player in an attempt to overwhelm them. Just like their regular Fallen counterparts, they can be deployed by Splicer Walkers. They are also more maneuverable than their regular counterparts.
List of appearances