Hey, I've followed the mod for a bit, and am really enjoying it, but right now, continuing with the Might/Blink problems, there's two major bugs with it, which makes the game much less enjoyable for me since I almost always play a kitsune mage.
First, like Zakanard mentionned, when Might ends, your current HP drops, even if it's not higher than your regular max HP; the drop seems to have some relation with the difference between your regular and with Might max HP. In combination with the second bug, it almost always brings my HP to 0 unless I cast an heal during the fight; it doesn't kill the game for me only thanks to Body Cultivator's regen. I didn't really notice about Blink and Fatigue, but then I'm using a level 42 9-tailed kitsune mage with spells costing 10%. I don't really look at my fatigue gauge at all anymore. On this note, though... maybe Wizard Endurance should be multiplicative with Spellcasting Affinity? Making the minimum cost of spells about 14% (Medius Signet+Spirit Focus+Ebonweave Robe additive, with 50% Spellcasting affinity multiplicative and History: Scholar multiplicative)
Which brings me to the other point, right now, all buff spells seem to be way stronger than they should be and have some weird interactions. For example, on my level 42 characters, I get to a whopping 1000 on Str, Tou and Spe with Might and Blink, and to something like a 200 on weapon attack and armor defense. Even if I use a Bimbo Liqueur or a Bro Brew, I still get about 400 on the stats, didn't check for weapon and armor. This absolutely trivializes any fight I get into; even Marae I can easily defeat with that.
And for the weird interactions... This effect is DRASTICALLY reduced if I activate debug; instead of 1000 in stats, I get to only about 150. Additionally, even without debug activated, if I level up greatly (btw once there's more enemies between level 50 and 100 you should maybe implement an instant level up instead of choosing when to, cause after a while it's super easy to just farm the lvl 51 challenge golems and get hundred of thousands of XP), the buffs provided also start to lower; at level 100, I get something around 600 to my physical stats post-buff.
Finally, another, less common bug I found about Battlemage, Battleflash, Spellsword and Spellarmor. In two instances, to my knowledge, those perks will proc without a battle starting. This leads to you having Charge W., Charge A., Might and Blink be permanently applied to your character, and it reapplying when you enter combat. The only way to remove this is to disable the perks, enter a battle and finish it; it'll bring back your stats to the regular amount. The two instances in which this happens are: the fight against Valeria in the Glacial Rift (it procs when you get the choice to fight or surrender, then again if choose to fight, and doesn't goes away if you surrender), and when you approach the Sand Mother after subjugating her.
I have to say, however, that those two encounters also are bugged; like Physicaldamage said, Valeria keeps appearing as an encounter even after you recruit her, and for the Sand Mother, if you subjugated her, sometime a "battle" will start, which ends immediately and then gives you the option to either rape her or to talk her down, like after the original battle with her.
Sorry for the text wall.