The Matrioshka Brain is an immensely powerful computer build around a star, that produces 5000 of each science per month, and adds 25% research speed, 25% robot output, and 25% more unity output. These benefits come with an upkeep of 210 alloys per month. However, this mammoth structure can be further upgraded, reducing its output to 1250 science, but adding 4 habitable sections with unique districts and features.