If you haven't played with the Necron terrain rules yet they are a good laugh especially the abyss terrain. Two people had never played Necrons before so they decided to team up against me in a 2 v 1 match. They said they would give me any advantage I wanted
Looked in some terrain boxes and found several things to represent abyss and several of them. Read the rules for it in the codex but the amount of troops that fell off the bridge to cross the abyss was staggering. I just picked off their tanks and artrillery with my destroyers and rapid fired their collective asses with my warriors. The only caulties that game were 6 flayed ones, and 8 warriors who were caught in cc by suprise.
Well thats a good victory for me and it was an extremely funny game when you see an entire Eldar Farseer council fall into an abyss. Classic