It seems like there's some sloppy code somewhere in the Corruption spell. It doesn't function elegantly, with the new shard sprite failing to appear on the map on the turn the spell is cast.
More importantly, if you cast it on a shard which already has a shrine built, the shrine is destroyed but you are not able to build a new one. You can select the death shard and the "build" button appears but it doesn't work.
