Please ignore any and all advice coming from rugal (aka kirill_pivtorak) it’s quite likely that he holds the record of ruining the most builds due to faulty advice.
Take spr & krivis3 for example. Melstis drains a percentage of your max sp per second, with low sp this can still be managed via sp potions. But the higher your spr is the worse you will be at keeping melstis up via sp potions.
(Since said amount doesn’t scale with your max sp. It’s a flat amount.)
Also you don’t want to use blue gems, red gems are much better atm. (Credit to @Tampon & @arkgolf over at the ktos thread)
Red will add 580 max attack, which equals 290 attack on average. Blue gems are just a meager 177 magic attack. (though their -sp can be good.)
!! BLUE is outdated, it caps at 261 currently!! see post below.
Likewise, magic defense in r8 is currently quite high, ranging from 800 to 3000 values, and since it is calculated very early in the dmg formula it’s a major obstacle you’ll need to clear as a magic build.
Int makes it a whole lot easier and more affordable to do so. And should be quite good when/if int gets buffed.
Also keep in mind that zaibas is one of the few skills that scales twice of int. Once via int’s usual mag attack boost and once via Zaibas’s innate skill dmg + int function. (See: https://tos.neet.tv/skills/40104 )