Escha and Logy Obscure Gameplay Stuff
I've been looking at the game files and testing mostly item/property related stuff for the end game and figured I'd write the stuff that apparently doesn't exist on the rest of the internet. Formatting's gonna be pretty rough, but some people on search engines might enjoy this. I'm gonna call the effect stat quality like in other games because localizing it as effect was deranged.
General:
Property based effects like Tasty Healing and Calming Effect do scale with overall item power like base item effects. This includes things like item quality, properties like Destruction Up and skill power bonuses (up to 100% apparently).
This also applies to accessory base effects (probably not all). Treasure Grimoire's Skill Boost S scales from 20% to 25% at max quality, for example.
Weapon properties:
Skillful Attack adds +5% to combo damage rate and 25% Skill damage, Fatal Attack adds nothing, Forceful Soul adds 10% to CR. Comet Attack adds 12% CR and an unlisted 15% to skill power.
Accessory properties:
Wind Soul adds 15% to crit -damage- not crit rate and 33% to hit rate. Night Lord Soul adds 25% to crit rate and either has a 10% chance to reduce wait by 25% or a 25% for 10%. Dark God Soul reduces wait by 10% (for skills which may include basic attacks but probably doesn't include items). Absolute Senses increases crit chance by 15% and hit rate by 30%. Ancient Power reduces physical damage by 10%. Holy Soul reduces all damage by 10%.
Armour properties:
Heroic Soul looks like it "increases abilities" (+ damage dealt and -damage taken) by 7% at all times and seems to add an additional 7% damage (not DR) against bosses. I believe that's all enemies that play a boss theme (possibly except boss theme 1).
Item properties:
Sweet Taboo reduces turn wait by 10%. Angelic Healing is bugged and either acts as an auto revive or just adds 25% to the survival chance (maybe just once)? Either way, it's hot garbage and not worth spending 5 hours building around as a lynchpin of a superboss strategy.
All Stats Up S increases one pool of stats by 12 and another by 25. I'm assuming it increases physical stats by 12% and resistances by 25% but I'm not sure. The physical stats might increase by a flat 12 instead of 12% too. Attack up S only increases it by 15% (or 15) so it's probably not worth worrying about, but Def S is 30 and Speed S is 50. You could consider applying those in addition to the All Stats Up. Element Res S are 30%, so assuming the all stats' "25" is elemental resistance they're probably not worth bothering with.
This is all just info on stuff I found potentially interesting. I might be able to answer some other item/property related questions, but I probably can't answer skill or calculation related stuff. I can't seem to find where they're kept.