A little change about doom since doom can be overwritten by attachment and it is maybe the unique attachment with a 4 duration and the unique that need to last until end to work. Make the doom reattach to the character at the start of every turn: First it will be Doom 4 then it will remove itself and attach a Doom 3 then a Doom 2 and then a Doom 1. It is a kind of matrioska but this way the problem that a doom can be cancelled attaching any 3 attachment can be resolved. Also i think should be logical use Doom with also encumber but i don't think that hitting a char with a frost jolt should heal it from a deadly curse
