UPDATE: I asked my plant AI app and it said root rot and what to do. I cut off the rotten part of the root and all the dead leaves and I'm letting it callous over and I'll repot it. We'll see what happens. I don't know how it happened because I always let the soil completely dry out. 🤷♀️ This plant wasn't doing well so I took it out of the pot to check. What the heck??? PS it's a tiger aloe.