[Name], Fortification Engineer
As long as CARDNAME is deployed, Locations you control have "Your characters take 2 less damage while in the Defense Zone."
At the end of the turn, if CARDNAME is in your defense zone your fortress heals for 5 health.
Add some earthworks here, a bastion there, a good ditch in the front... it's not much, but I can work with it.
Basically, he turns any location into a Great Wall of Jinhai. And the Wall itself gets even stronger. I made them 1 purity so they could combo with other factions' locations, gave them 5 health because I didn't want good stats but I hate it when stuff dies to a single lightning blast or firebolt. The Field Engineer ability is designed to encourage people to put them into the defense zone where they'll be more vulnerable to removal/combat death while also giving utility if you don't have an artifact. 3 cost was specifically designed to curve into Wall, notably, but it's worth noting that at that cost they're competing with Dojo (also intentional).