Shackling from your undead and poisoning him would not do any damage to anyone. Shackling from a living unit still requires dealing large amounts of damage to your own team. Honestly the only way you could do damage is if you use the Soul Mate combo, but that is a legitimate bug that will hopefully be patched out soon.

Using a magic armor spell on the Bone Widow is possible, but only if it is off cooldown and on the character who cast Bone Widow. It also doesn't get rid of all debuffs anyway, as the Widow could still be Mad or Charmed.

So yes, they should get rebalanced, but I really wouldn't even call them all that overpowered compared to other skills in the game.

The real thing everyone should know is that balancing is HARD. As someone working towards entering the industry, I've had to do some practice for balancing, and it is much harder than you would think.

I do hope the games balance gets improved though.