Checked the saves and tested that Kyrre could have taken down Solmyr on grass as early as Day 135. Cast Slow, take out the Nagas, then Mages with Unicorns, then the rest. Chain Lightning doesn't save him. And even attacking the Castle, there were good chances. Solmyr never got Logistics, which once again confirmed the theory
Checked the saves and tested that Kyrre could have taken down Solmyr on grass as early as Day 135. Cast Slow, take out the Nagas, then Mages with Unicorns, then the rest. Chain Lightning doesn't save him. And even attacking the Castle, there were good chances. Solmyr never got Logistics, which once again confirmed the theory