Remove the Nihilanth and put in GLaDOS.
"Well, you found me. Congratulations. Was it worth it? Because despite your violent behavior, the only thing you've managed to break so far is my heart. Maybe you could settle for that and we'll just call it a day. I guess we both know that isn't going to happen. You chose this path. Now I have a surprise for you. Deploying surprise in five, four... Time out for a second. That wasn't supposed to happen. Do you see that thing that fell out of me? What is that? It's not the surprise. I've never seen it before. Never mind. It's a mystery I'll solve later... by myself... because you'll be dead."