NeoSG
Hmm... Well I don't think she is fully immune to pain... Because she was definitely hurting when she was fighting against HoD. Though maybe higher pain tolerance would suffice.
Melusinee:If I'm not mistaken it was in Chapter 13 but I forgot what stage it was, I also searched the Fandom and these are some of the effects that happen to people who are infected with honkaiimage
I would say Honkai energy would be more "potent", as Honkai energy also improves the physique of its users and can break natural laws more easily than Mana. Mana I would say because it is more neutral than Honkai, and because spell creation is complicated and all the world restrictions that exist in Fate make it more difficult to manipulate, but to compensate Mana has conceptual effects that would be difficult or impossible to achieve with Honkai energy. And author-san just remembering only mages from the Age of Gods can use Mana from the air/atmosphere, modern mages produce their own mana (Od) inside their bodies to charge their magecraft.
honkai should be in high dimensional chuthu tier powerwise, but thats the whole tree. Kiana can only ruin a whole city the size of New York if her core is not connected to the imaginary space with in about 30sec as the honkai energy radiates everything forever since theres no divine key to clean the world for thousands of years. the magic power would also fight her when she makes things just like shiro. who wants a spacelance that lasts for only a hour or two bo0.