Cookie Clicker Ascension provides mainly two benefits: the first one is prestige bounces, and the second is heavenly chips. Every single Prestige level will add 1 per cent to your total cookie production per second. So, suppose, if you have 50 prestige levels, you have a 50 per cent bonus.
What do you keep when you ascend in Cookie Clicker? You keep your prestige upgrades and the purchases you made with heavenly chips. You also keep your achievements. Everything else will be gone and not accessible in your new game. How many heavenly chips should I have before I ascend?
Heavenly Chips. Heavenly Chips is a "new game plus" or "Ascension prestige" mechanic introduced in Cookie Clicker version 1.035. If you ascend by pressing the "Legacy" button, you will gain Heavenly Chips and be sent to the ascension screen. The amount of Heavenly Chips is dependent on your forfeited cookies of all games.
Depending on how many cookies you have baked, you will earn Heavenly Chips and Prestige Levels when ascending (at a 1:1 ratio). Heavenly Chips are used in the Ascension screen to purchase Heavenly Upgrades, which are permanent throughout ascensions and provide various benefits.