I get it, but they won't attack me if I don't attack them, right? And decay doesn't seem to affect them. So, if undead will attack me if my allies attacked them, then I'll research animated weapons. If I can stay safe from undead by just wandering around and not touching them, then I'll go for summoning.
It doesn't.
They won't.
You can be safe.
You spoiled it!
Небо – угроз не слышит
Небо – ведёт особый счёт
Небо – тебя найдёт