Just a small patch that fixes some issues that cropped up due to the recent "What Lurks Below" patch:
Reduced the productivity bonus granted by Artifacts (especially for higher-tier artifacts, lower-tier unaffected).
Troglodytes can no longer spawn on Dig Sites if they have a Fortress adjacent.
Changed the "Ancient Legacy" achievement to now require 100 Prestige, as the previous iteration is now no longer achievable.
Fixed the build cost calculation of Fortresses not resetting properly.