Sun Refuge Upgrade items locations?

So with Sun Refuge's release, I notice the addition of extra things into the game that will upgrade and add things into Sun Refuge.

Has anyone located the specific items that upgrades Sun Refuge beyond Collector achievement upgrades?

So far I found a Pact Excavation Contract in the Pact Heart Shop (cost 5 Gold) in the new Map which upgrades Sun Refuge by adding Pact Soldiers into the place.

I wonder if these upgrades may later affect the final battle against Kralkatorrik by adding more allies and options during the Kralkatorrik Campaign?