Conversation so far:
What was X-Infernus?
X-Infernus is a four-issue comic book mini-series that started in December 2008.
What was X-Infernus about?
X-Infernus was about the X-Men entering Limbo and fighting multiple enemies.
What other events happened in X-Infernus?
Using Pixie's Dagger, Kurt then pulled Illyana's Soulsword from her, and used it to free Wolverine and Colossus of Witchfire's control.
Why did Kurt stop Pixie?
Pixies soul stones would be used for evil if Kurt didn't try to stop her.
What are some other interesting aspects of this article?
It was subsequently proven that Kurt's mother is Mystique, and his father is the demonic warlord Azazel.

Question: Where did they enter?
Self-contained rewrite: Where did the X-Men have to enter in X-Infernus?