Dokebi Card vs Steel ChonChon Card

[ABlueJelly]

Well, the order doesn't really matter, minus the before/after % redux.
How it works is everything adds with itself. All of your resist X element adds together, all of your resist X race adds together, all of your resist X size adds together (separately). Then, all of the applicable resists are applied multiplicatively. This works the same for damage cards. EXP shoes' bonus damage from X is just a negative resist, it's still additive with your other resists (Thara Frog + Am Mut = 30% + -20% = 10% resist Demihuman)
EXAMPLE: Hodremlin card in a Stone Buckler, Beret, Am Mut shoes, spiked scarf
15% + 5% = 20% resist Large
10% + -20% + 2% = -8% resist Demihuman
Up against a mounted knight/pally (who are large), all damage they do would be 100% * 80% * 108% = 86.4% of their damage output.

So. The reason why you want ONE resistance is because of how multiplication under 1 works. 90% of 90% of 10 isn't 8, it's 8.1
However, this works the same in reverse for attack- 110% of 110% of 10 isn't 12, it's 12.1
So, if you stack one resistance, you get a higher net % resist, while stacking multiple attacks, you get a higher net % damage.
Just remember to multiply it out.
Hydra Hydra (40% vs demi; 40% net) > Hydra Skel (20% demi, 15% medium; 38% net)
unless your base atk is less than 100 or something...

Elemental affinities are like a bonus % applied last. 25% vs same, 50% vs strength, 125% vs counter, 100% vs parallel (all for level 1 elemental armors). Now, holy/shadow/undead are different, but that type matchup chart will work just fine. Just remember, you're level 1 of the element, but monsters can be higher.