Does anyone have the formula for the damage multipliers in Tiny Dice Dungeon?

I'm trying to make a spreadsheet that allows me to enter the stats for the four collectibles I equip to my character.

I want to know based on the four collectibles I chose what my damage will be against the varying types of monsters. I can't seem to get the math right.

I find the section of Advancing Levels somewhat confusing in how it's written

http://www.tinydicedungeon.com/Guide/GuideIndex.html