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"...how did they get in?"
This was what Raven asked as soon as all the intruders died. His and the other's expression were grim. He looked around and saw that the ones who died weren't only the intruders but some of the guards as well.
"We have no idea either..." Henry replied, wiping off the blood on his sword. "Somehow, they managed to breach the fabrics of space and infiltrate the pocket dimension of our sect. They murdered the guards, I happen to be at Tartarus so I sensed the commotion. I couldn't see them so I could only try my best to prevent them from entering."
"He called us here, but we also couldn't see them. They were unnaturally fast and they have something that's preventing us from pinpointing their location. Thankfully you came and undid their invisibility." Charles added as he removed the dead bodies in his spear.