Short post. As The title says one of the players in the group I dm for took a homebrew cantrip for his Warlock that let him role 6D12 as a bonus action without even a material cost, ritual, or concentration at level 4. He never even asked if homebrew was okay and seemed upset when I told him he needed to switch that spell out for something in the books. Wild to me that some people get upset when you wont let them be so overpowered that it destroys any semblance of difficulty balance.
Also I now feel like I should look over his character sheet to make sure he isnt trying to sneak other pieces of fuckery in there.