They’re just too OP. Especially the energy one. If you have 2 of these that are legendary, you can just always overheat/energy drain anyone with energy/heat lower than 250, which is a lot of noobs (like me). Anyways, I think they should be nerfed by either:
Giving them turns
Make them not drain max heat/energy
Make them drain less
Make them do less damage
Make them require much more energy/heat
You can do all of these or just one, but I’d like giving them turns so it doesn’t go on forever.