What Mist Elf classes are you playing? They've actually been largely fixed since p7 when it was much harder to keep them alive, by giving them an extra 1 HP per level (makes a huge difference). (and they no longer only give you a staff of creation for crowning, opening up some nice melee classes) Of course, I don't know if the Hardy talent line has been fixed (I believe the HP modifier for mist elves was applied to the talents, making them largely useless), but that doesn't matter because you're definitely not getting Extremely Hardy and you'll be lucky to get Very Hardy. Still, get what you can ASAP.
My suggestion is to play a Mist Elf Barbarian. They [seem] like they'd be a lot of fun. I definitely don't recommend a Mist Elf Beastfighter because they level far too slowly to output enough damage in the mid-game.
gate closers: GeWi GnMo(unarmed) DeAs/Pa/Mi(staves)/Ra GePr DrBb HrMo | p7: MeBf | p17: GnPr | p20: DrDu GnAs DeCk MeWp OrBf GnTh MeHe | R57: MeDu | R101: DrAs (26,674 turns) GnDu (26,748) DrAs (18,533)
ULE: HeRa — OCG: DeMi
currently speedrunning DrAs.