Eldar Vibro-Cannon. First off, Artillery just got a lot tougher. Add a warlock with conceal (5++) and even more survivability.
Rolls to hit, one d6/weapon in battery. Add a Warlock to boost BS of one shot from 3 to 4.
Draw a straight line 36" in any direction from any of the weapons.
It also auto-glances vehicles!
Imagine 2 Batteries of 2...can bring down a flyer/turn.
Throw in Guide when you need it...get a good line up and hit multiple vehicles per turn.
Thoughts, ideas?