Brilliant energy is a type of energy associated with the Divination skill. It can be collected from Brilliant wisps, located east of the Mage Training Arena (fairy ring code BIP) at level 80 Divination. Each harvest gives 9 Divination experience, and Brilliant memories can be converted to Brilliant energy for 1 experience, with the exact amount of energy per memory depending on your Divination level. Brilliant energy is used to charge the Time engram for the Memorial to GuthixD&D starting at 250 brilliant energy for prestige level 1 and going up to 450 brilliant energy for prestige level 3.
One brilliant memory and 5 brilliant energy can be converted for 43.7 experience, while one enriched brilliant memory and 10 energy can be converted for 87.5 experience.