Ok, let

[Snottbarian]

Ok, let the secret out!
What's the next instant upgrade after oil wells.... and the next.... and the next etc?

 

[LordStark263AC]

Sticking to method of elimination, it HAS to be Storehouse.
I mean what other non-defensive buildings are there that could be upgraded instantly?

 

[Seek]

Who cares it’s free lol

 

[Spaceboy]

It is the Temple now…