Unlocks Unicorn Rifts, a random event that generates unicorns.
Each Ivory Tower increases the frequency of this event by 0.05% per game-day, or 1% per day per 20 towers.
As of 188.8.131.52b you get a boost to your unicorn rift amount equal to 10% of your unicorn ziggurat bonus to unicorn production.The amount of unicorns you get from a rift is 500* (1 + your unicorn ziggurat bonus production to unicorns/10)
If you have reached Apocrypha (ability to convert worship to epiphany) at the end of your first run, resetting on the required 100000 worship will give you a 10% bonus, which will allow you to buy the first two transcendence tiers on the following run. To get enough worship to buy transcendence tier 3 at the end of your second run, you will need 293750 worship at the end of your first run (assuming you are converting manually).
See the Apocrypha page for more information on epiphany and Transcendence.
Insights into the mysteries of time and space. You gain access to Cryptotheology after researching the Cryptotheology technology, and additional Cryptotheology levels are unlocked by Transcendence Tiers, which are bought with your Apocrypha.
Transcendence Tiers and all cryptotheology buildings bought will carry over when you reset, but the technology named Cryptotheology will not. You will need to research the technology again to see which buildings you've purchased or to buy more.
Unlocks Post Apocalypse applies on reset: -1% max kittens (DR's starting at 75%) +2% karmakittens and paragon per kitten +2% kitten production per housing (offsets your loss to lower population, then gives a 2% boost) (provides the same boost to zebras, but without the decrease to max population)