For those interested, you can use IGG to get additional resources, speed up progress, and there is a bug for high subjugation kills.
1. Selling arts (you need to sacrifice 1 art) : Select around 20 arts (just to lower the chance of IGG crashes) then search for the number (Int32). Add or substract and redo the search untill you are left with just 1 result. Then press it, select "set watchpoint", go to IGdebbuger and add "Jump 1 function". The last art will always overwrite the rest, and it will be the sacrificial piece. Do not sacrifice arts higher than heroic, there's no point. This works for relics too.
2. Fast level progression: You can lock the number of hunted enemies so you'll always fight the boss. Search for 3010xxyyy (x is chapter, y is level, by example 301015100 is chapter 15 lvl 100, or 301015099 is chapter 15 lvl 99), you will get around 6 search results. Press on each one and select "memory browser", find the one holding the hunted number count and lock it at 100. You can also change the boss timer if you play around with the other adresses, to find it easier the timer its always held where is -1 under 3010xxyyy. To change the timer of the last level you need to search the previous level. By example if you want to change level 100 timer, search for level 99 and scroll up in memory browser.
3. Elemental timer and subjugation bug. For elemental timer you need to play around with the memory browser, elemental adress is 3013xxyyy (xx is 01 for first element, 02 for the next etc), 3011xxyyy and 3012xxyyy are for seal tower and subjugation (i may confuse them so play around). For the subjugation bug, you need the legendary art named "Exorcist's Command Spell" otherwise you'll be unable to do damage. You need to start a subjugation, pause it then minimize the game 2-3 times, eventually your character will start moving even if the subjugation is paused. Only the art passive works (deals damage) so its required, use it with IGG speed changer at 50x and you can basically get unlimited kills.
4. At a point monsters will get an annoying barrier who is unaffected by damage multiplier, fire arts come into play here, they always (except when dodged) 1 hit regardless of the barrier.
Other minor things you can do with IGG is change the stats lvl up from 1x-10x-50x to whatever you want. Warning, do not use it in "training" with negative value, it will ruin your game.
Also do not rank up to the last level, rank based on your power level and other player strenght/builds. Check the pvp ranking to see other player builds.