I will attempt to compile all of the issues, bugs, imbalances, and ugly things that I can find into this list for easy tracking and fixing by Steelb_l_ade.

*Reported as done/added to next update by Steelb_l_ade but not yet confirmed ingame
#Seemingly unfixable

The Good
6/6/18 Nurgle's healing ability is probably too powerful, compared to other healing in the game. It is very effective at keeping characters alive for its cost.
6/11/18 Daemonic aura that lord of change has grants up to 15% ward save with 3 skill points. This is extremely powerful on a lord that starts with 25% ward save and has tzeentch skills to raise it even more. Add items and it is possible to go over 100% ward save.

The Bad
5/21/18 Corruption skill is pretty horrible because chaos armies get massive amounts of corruption anyway and increasing it by 4 or even 12 will only change the province max corruption by a tiny amount, which will never be reached anyway because chaos doesnt stay there long. Is it possible to make it give corruption to nearby provinces?
5/21/18 Arch Heretic role requires level 8, but by the time the lord is level 8 they are not using cultists anymore but have moved onto better units. Maybe better to lower it to level 1 or something low so it can be properly assigned to the weak lords who use cultists can have it assigned to them. Lords who use cultists generally arent doing any fighting anyway and are hiding in the back till they can grow.
5/21/18 Tzeentch forces seems to like chaos spawns, having some ways to buff them, but no way to reduce their upkeep. This means it is unprofitable to use them in an army where other units with similar power will cost less.
5/21/18 Slicing shards (slaanesh spell) seems rather weak in the damage it does, considering that you have to make the enemy rout in order to use it (and therefore not use your countless numbber of other slaanesh abilties that make the enemy unbreakable and also already win or nearly win against that unit). It seems to do about as much damage as hysterical frenzy.
5/22/18 Nurgle spell that grants poison weapons is pretty redundant since there is a lord skill that grants it to the whole army and most nurgle units already deliver poison.
5/22/18 There is a serious lack of AP damage on all 4 paths. They do far far less AP than regular chaos units.
5/22/18 Slaanesh trait Alluring is quite useless since +6 leadership does nothing on slaanesh heroes/lords and the -1 leadership on enemies is basically nothing (nurgle traits can give 2/4/5 leadership loss). The tooltip suggests it should have a stronger impact on the enemy's psyche than it does.
5/22/18 Tzeentch basic fireball spell is weak for its cost, as it requires far more mana than the regular fireball and is only somewhat stronger. Perhaps lower mana cost by 2 or buff its dmg a bit? Now with the changes to vanilla fireball (a good deal of its regular dmg has become AP) this applies even more.
5/29/18 Chosen Swordmasters have stats lower than their peers.
6/6/18 Undivided have less upkeep reduction than path units and need more of it.
Path chaos reduction: 20% from buildings unique to them, 16% from skills, 10% from innate lord ability
Demons get 25% more
Path knights get a bit more too
Undivided chaos reduction: 15% (chosen) -30% (most units) from buildings unique to them, NOTHING from skills
This makes chosen really expensive compared to units of similar power from other paths.

The Ugly
5/21/18 Corruption skill tooltip at lvl 2-3 suggests it does nothing at those levels.
*5/21/18 Cultist boosting ability suggests it boosts attack and leadership of cultists, it actually boosts damage and leadership instead.
Khorne boosting ability suggests it gives attack and charge, actually gives damage and charge.
#5/21/18 There is no keeper of secrets, maybe not fixable without using an ugly model.
5/21/18 The final upgrade to giant recruitment building that lets you get a dragon doesnt reduce upkeep like the previous one did.
5/22/18 Demonic Invigoration says it increases atk and armor, it actually increases dmg and armor.
#5/22/18 There is no lord version of the great unclean one.
5/22/18 Louen the bretonian king (and maybe others) can get premonition trait saying he is blessed by Tzeentch. Eg. https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1393172033
6/10/18 Regiments of renown are not properly aligned with factions (eg. daemonspew arent nurgle units, etc).
6/11/18 Tzeentch army boosting skill claims to grant damage (a tiny amount compared to spawns' 160 dmg) only to spawns but in fact grants it to both tzeentch units and chaos spawns.
6/11/18 T3 slaan upgrade has a tooltip "the lure of chaos is a seductive force" which sounds very awkward. Perhaps remove "the lure of" as this would probably make it look better?
6/11/18 The tooltips of nurgle champion abilties "Putrescent Explosion" ("You really want a description for this one?"), "Indescribable Foulness" ("It's indescribable"), and "Stream of Corruption" ("Vomiting forth such a tide of foulness would never occur outside of watching Jersey Shore") are horrible and immersion breaking.

The Broken
(need to find what is causing/how to reproduce) 5/21/18 Picking sigvald blocks quests for archaon and Kholec, so you cant get their items. Havent tested with others yet.
5/21/18 Demon recruitment time reduction upgrade doesnt reduce their recruitment time, it is still 3 before and after researching it.
#5/21/18 On low unit size, pleasure cannon and hellfire batteries have just one unit in them.
5/21/18 Infernal gateway (tz spell) seems to be unable to target anything. It supposedly targets "ground" but shows up as not a valid target wherever it is pointed. Basically the spell cant ever be used. Maybe have it able to target enemies? Edit: it seems it is a Direct Damge spell, and therefore the game tries to target it upon units, but this is not a valid target for it so it fails. It will probably work if it is allowed to target units and not just the ground.
#5/21/18 Some path boosting skills (nurgle and tz) do not count as skills for the purposes of requirements of the next skill eg. https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1391692067 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1391725616 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1396581174
*5/22/18 Artilery batteries are not immune to horde infighting like their solo versions are.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1409260029
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1409260247
6/14/18 missing chosen slot with Sigvald as starting LL, and most positions except arch heretic cant be assigned to anyone.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1411791243