Idiot Savant

Idiot Savant is a perk in Fallout 4.

Effects
This perk will randomly multiply the amount of experience gained from any action that grants experience, including quest completions, making it very useful to grab at a low level so that you can maximize the amount of extra experience gained. The effect is multiplicative with the well rested bonus giving a total multiplier of 3.3 or 5.5 depending on the rank of the skill. The effect is also multiplicative with the additional experience gain resulting from having points a higher intelligence.

When the perk activates, you will see a laughing Vault-Boy above the compass, as well as hearing a laughing sound.

Despite reports from other sources, once you obtain the second rank of the perk, it grants a 5x experience bonus every single time the perk activates. There is no tiered check that determines whether 5x experience is granted, then whether 3x experience is granted.

For Intelligence of 1, this perk has a 10% of being triggered. This percentage decreases by 1% per point of Intelligence for a minimum chance of 1% when Intelligence is at 10. At 6 Intelligence, the chance of triggering the perk is 5%.