You may have noticed that the Arcane Nexus disappeared - thanks to its caster being one of the first Astrologers afflicted by BoT. Least they've managed to take some of your commanders to Hades with them, courtesy of Mind Hunt.
But, why I am telling you this? So that all your two-legged goats can gloat?
(I'll second Valerius' comment about it helping upkeep. Suiciding droves of my predecessors' chariots into your territories also helps a bit.)