Upgrade banishing feature implemented. Purchase banish credits in Permanent Upgrades. Note that you can mark an upgrade for banishing and still pick it - that way you get it once.
Fixed “double damage” achievement sometimes not unlocking. There was a discrepancy where reaching >=40 threat level triggers the Steam achievement, but >40 threat level was required to unlock the upgrade. The unlock requirement has now been updated to match the Steam achievement, i.e. >=40. This will not apply retrospectively.