I created a thread a while ago that discussed this. You can also use my Temporary Effects Damage Calculator to run the numbers yourself using the damage formula posted on the JP wiki. In short, the odd scaling occurs because defense is in the divisor of the damage calculation, and thus a 50% reduction in defense results in double damage.
Magicami Starter Guide: Rerolling for Success
Rerolling in Kamihime Project: How to get FREE SSR Kamihime
Sanahtlig's Kamihime Project Toolbox: Includes damage calculators and other useful tools, data, and info I've designed and collected. Make a copy to edit.
It is something you'll come across in many games. The short version would be, when it comes to % reduction, it stacks upon itself.
Let's say that there's a boss that deals 1000 damage with a normal hit. Mathematically we'd use N (or X) for it, but fuck it. This is for demonstration, so we're using a number.
The boss already has -0% Atk from previous debuffs, doing 1000 damage to you. You use a -10% Atk debuff. The boss now does 900 damage (100 less). You're taking 10% less damage from using a -10% debuff.
The boss already has -50% Atk from previous debuffs, doing 500 damage to you. You use a -10% Atk debuff. The boss now does 400 damage (100 less). You're taking 20% less damage from using a -10% debuff.
The boss already has -70% Atk from previous debuffs, doing 300 damage to you. You use a -10% Atk debuff. The boss now does 200 damage (100 less). You're taking ~33% less damage from using a -10% debuff.
The boss already has -90% Atk from previous debuffs, doing 100 damage to you. You use a -10% Atk debuff. The boss now does 0 damage (100 less). You're taking 100% less damage from using a -10% debuff.
As you can see, the more % reduction you've stacked, the better and better it keeps getting. Once you go past 50%, it's especially better.
This is also useful for other games. Like, MMO tanking stats. If you have a game where, at the start of the game, you can only reach a total of 30% parry+dodge in the best gears, everyone will probably laugh at the avoidance stats. But as the game gets more gear, once that 30% starts going past 50%, suddenly avoidance gear starts to be completely broken. And if you reach 90%+, you're going to be trying to squeeze out even a single avoidance stat more, since as you close towards 100%, it just gets absolutely broken. Most games don't allow for this, which is why "diminishing returns" exist.
It's useful to conceptualize this as effective HP or # of hits that can be absorbed. Then the results exactly mirror the impact of DEF down on damage dealt. 100 less damage doesn't sound like much, but starting from 500 damage per hit, it increases your durability from 2 hits to 2.5 hits (25% increase). Add in the impact of healing and your durability could increase even further.
Magicami Starter Guide: Rerolling for Success
Rerolling in Kamihime Project: How to get FREE SSR Kamihime
Sanahtlig's Kamihime Project Toolbox: Includes damage calculators and other useful tools, data, and info I've designed and collected. Make a copy to edit.
+100% eidolons
Starting around November 2017, +100% elemental attack eidolons will be released for each element over the course of ~9 months. While these are the strongest single upgrade you can seek for your team (~28% damage increase), the odds of rolling one for your primary element are low: ~1.2% per 10-roll under optimal conditions. In other words, your chances of landing the one you need are vanishingly small unless you’re doing dozens of rolls. Saving jewels for a few months for a shot at one could be beneficial, especially if the SSR kamihime it’s introduced with is strong, but don’t get your hopes up. These eidolons are essentially bait to give the high-rollers something to spend on.
Magicami Starter Guide: Rerolling for Success
Rerolling in Kamihime Project: How to get FREE SSR Kamihime
Sanahtlig's Kamihime Project Toolbox: Includes damage calculators and other useful tools, data, and info I've designed and collected. Make a copy to edit.
Well.. I know, it's the type of game this is and all.. but with how hard it is to even pull anything right now as a F2P player the chances of getting one is basically zero. It's obviously targeted at whales as you say, and the fact that luck can for the most part be negated by cash is a major turn off for me. I grind my ass off as a F2P player to get just enough to 3k jewel pull, that or save up for multiple pulls.. and end up with nothing and an insane amount of time wasted on this type of game. I can only imagine it getting more and more P2W from here, and it's already bad as it is. They may be the lifeblood of the game, but this just makes it even harder for F2P players to compete..
So now I ask myself, should I quit or should I waste 10x the amount of time a whale pays to get one (or multiple)? I honestly don't know, on the fence with this personal question.
Except that's the very definition of whale, money isn't an obstacle. Shitty definition from urban dictionary.
I can only see it getting harder as a F2P player in the future, so guess I'm leaning towards quitting.
Depends what your goal is. Do you want to be better than everyone else? Do you want to be able to complete all available content? Do you have a certain milestone you're aiming for, like completing Ultimates or Advent Ragnaroks? How much are you willing to pay? What's your tolerance for grind? Are you an obsessive collector that absolutely needs every character?
Magicami Starter Guide: Rerolling for Success
Rerolling in Kamihime Project: How to get FREE SSR Kamihime
Sanahtlig's Kamihime Project Toolbox: Includes damage calculators and other useful tools, data, and info I've designed and collected. Make a copy to edit.
I'm just concerned that as a F2P player that didn't reroll and has subpar setups (and luck) that eventually events will become too hard to complete in a timely manner. I don't want to be doing 1150+ Standard runs when I could be doing 150+ Ultimate runs. Since they introduced 100% (120% if maxed) Eidolons, then who's to say they won't release 200 or even 300%.. or come up with an entirely new rarity that is even harder to get than SSR lol. The best Eidolons / Himes / Weapons may become a requirement just to complete events. These are all what-ifs I know, but the game is already time-consuming enough as it is.
I've learned almost everything I need to know about the game, it's just RNGesus is my bane.. that and the habit of typing walls of text.