Summoner was last enemy troop with just 7 life left. As I killed him an Ancient Horror spawned !
Might be of academic interest to the devs. 
Pretty sure that’s the Summoner’s Deamonic Pack trait kicking in.
Its just the useless Daemonic Pack trait. I find the trait to be an anti-trait. Summoning a weak level 15 with no kingdom bonuses nor traits is okay on the rares that have the trait, but having it happen on Legends is just a mana blocker and weak attack.
@Jainus
Oops you’re right - headline should have read ancient horror lol - anyway he was dead as he spawned it
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Daemonic Pact should be a 25% chance to summon The Silent One. 
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Ahhh…there we are then. Never noticed that trait before. I can un-knit my eyebrows now
You can knit with your eyebrows? Now that WOULD be a talent…
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What? The Silent One should be able to summon himself?
Yes, The Silent Two.
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They would banter with each other through extreme eyebrow expressions.