Bloodmoon Massacres
From Warhammer 40k - Lexicanum
"Pray that night is upon us, for if this twilight is the work of the Necrons, we are all dead men."
The Bloodmoon Massacres was a battle in M42, which saw the Necrons defeat the Ultramarines Chapter. As they fought, the Necrons caused the sky to turn black before beginning a massacre that gave the battle its name.[1]
Sources
- 1: Magic: The Gathering's Universes Beyond Warhammer 40,000 - Go for the Throat Card Description