Quote Originally Posted by Cilia View Post
Sufficiently powerful Voidsent can't cross natural dimensional fissures and they are by nature chaotic creatures, so Voidsent have never launched a full-scale attack on the Source. (May or may not change depending on Golbez' plans.)

Voidsent adhere to the rule of power; if we're able to take what we want, we're wholly justified in so doing by their standards. I don't think they much care.
Keep in mind, however, that most voidsent worth their salt are manipulative as all hell. Just because they can't open the door themselves, doesn't mean they can't get someone else to do it for them under false pretenses. Which is what Diabolos did, and is basically the core skillset of succubi.