Fused Fox Fire require PC have both paths perks (that can be done with perming two perks form one path and then getting two others in next game play). YEs that mean without cheating fused fox fire can be gained in NG+ or higher NG tiers.
For 8th tail it's lvl 42 and for 9th it's 51 lvl. Also in both cases PC Intelligence need to be high enough (well last 9th tail req. around 160 or 180 int). And to get 8th tail PC need use the same way like for tails 1-6. Only 7th and 9th tail are gained in different way due to both been connected to gaining kitsune perks (so for those two tails or meditation in shrine or using mystic jewel). Also after PC picked at 6th tail which path want to follow without loosing all tails it's impossinle to get other path perks. Ofc with ascension and using asc perk points to perm those attained during playing kitsune perks can let PC get both path perks (4 in total).
To meet Kitsune npc (she's named Ayane) PC need to be kitsune with at least 2 tails while exploring deepwoods. She would be found during exploration of shrine foundable in deep woods. Also to trigger pure or corrupted path of her recruitment to camp PC need to be 9 tailed kitsune (so yes that mean been lvl 51).
Been Chimera mean PC body is mix of differentraces body parts and negative HP regen is...result of this werid composition of body acting as the price for mixing different races special intermal mutations (only those mutations in form of bought special type of perks will triggenr negative HP regen effect that can be countered by or having enough high normal positive regen from perks like Regeneration or using Chimera perks to neutralize partialy/fuly effects of those internal mutations).
Grey magic is only learnt form Grey Books that drops from Valkyrie. No other way to lern those spells nor get book dropped by other enemy than Valkyrie.
On souls kills COmet and Many Birds still need to be balanced in effects but Comet is AoE soulskill so that is sort of the reason that despite much different costs their deal similar dmg "to single type enemies". Trying them out on golems on arena will alow to see that on single golems and group of golems dmg from comet is diffrent while many birds will in both cases giving the same dmg output.
@Gplikespie There isn't Xianixa wiki so far made - I not have...well much time to make one so constnatly I looking for someone that may have enough time and well motivation to be admin of xianxia wiki.
@Lunaraia MIndflyer may be implemented in around 2-3 months form now. FOr now I finaly started work on adding Gargoyle TF to the game (it's quite huge thing compared to other TF's in the game - it invlovle adding new location with 1/2 gargoyle npc's and dungeon that will still be findable by PC that nto ant to became gargoyle but will in such case give less benefits of finishing it). So when I do this larger addition I think will turn my gaze to work on mindflyers.