When a player encounters a horror beyond their comprehension, roll 1d6. if the number is even, they gain a phobia. if it's odd, they gain a fetish.

If any weapon is used to kill enough people in a short enough time, it gains sentience

Each damage type has a corresponding healing type that can only be used to restore HP lost from that damage type.

when a player fails an insight check, instead of giving them no information, or false information, give them information that is true, but absolutely useless, such as "this person seems like if you give them a stack of papers and tell them to take 1 and pass it down, they will likely pass each paper 1 at a time"

Don't tell the players the rules.

Every time you use a healing potion, make a d100 roll.

Critical 1s and critical 20s are boring and uninspired. No nono no,no.