>What if an insane drow/dwarf/human became a "mind flayer"-flayer who went around killing illithids and eating their brains?
>Probably die of prion diseases?
This. But IN THE MEANTIME
Dungeon Meat Part 3: Illithid Brains
Taste like horrible noodles spiced with vanilla, sulphur, and tallow. No texture at all, really. You could drink them with a straw.
Roll - Result
1-2: Prion Disease. Lose 2 points of Intelligence. If your Intelligence ever drops below 4, you have a 50% chance of becoming enraged until you die. Otherwise, you twitch and drool. You twitch and drool no matter what. Bring napkins.
3-4: Slimy. Save vs Con or lose any benefit from the meal, and spend the rest of the day queasy and gassy.
5. Memory Burst. Save vs Int or take 2 damage as an extremely vivid memory bursts into your brain. It might be one of the Illithid's. It might be a victim's. It might be both.
6-7: Mind Blast. As per the Illithid's power, fired in a random direction.
8. It's Eating Me! Save or slowly mutate into a Mind Flayer over the next 1d10+1 days. You retain all memories but your motivations become alien and cruel.
9. Mind Powers! Gain the Mind Blast ability once per day, permanently.
10. So Wise! Gain +1 Intelligence and Wisdom. If your Intelligence goes over 18, your brain plops out of your body and flies away. Your body still operates normally (the brain made a backup of your original personality, with Int 12, out of your liver and gallbladder), but your brain is off to explore strange new dimensions and experiences.