Shrine of Melkor/1.03

Swarm
This small building is another building dedicated towards researching skills, but some of the more better ones in The Swarm's arsenal. Summon Mana is great for Heroes and Scorpionpriests, who also get their own specific research in here, too. But the most important and sadistic research to be had is Melkor's Curse. This skill can actually make poison viable. However, it affects the poison mechanic, meaning all poisons in the game become affected by this, even the enemies. As the building is small, it can be chucked in your base somewhere without much care. Just remember that you still need to keep a clear path from your Dunekeep for Lord Melkor's arrival.