Azoth Drop
From Warhammer 40k - Lexicanum
In 999.M37 the Revilers Chapter launched a bold planetstrike operation, against the Daemonic hordes infesting the Plains of Azoth. Despite taking shocking losses the Chapter emerges victorious, though many survivors must undergo mnemonic purgation protocols; lest any taint of corruption result from the Warp-spawned insanity each witnessed in battle.[1]