I love the critical hits and fumbles mechanics in Dungeon Crawl Classics. It keeps criticals and fumbles exciting and fresh throughout a campaign! Combat can get bogged down with constantly referencing the book or notes, however.
As I look at what I want to incorporate in my DIY system, I knew I wanted that excitement on criticals and fumbles as found in DCC, but I didn’t want to have to look in a book for the results. I decided to create a die drop chart instead.
When a critical/fumble is rolled, simply roll 1d4 on the die drop chart (pic below) and consult the number on the die with the column in which it lands.
Here’s the chart as a PDF: