Inhabitants of Firiona Vie

Yeah, at the Firiona Vie city area you have firiona vice faction npcs then also SOME other faction npcs. Meanwhile, the pilgrams and drixies and things are on Firiona Vie factions.

Every mob only has a primary faction which you must raise to be in good with it, as Shmoozo says. You may lose other factions in killing it, but the only faction IT is on is one of them. That one faction is going to take the largest dive.

For example, in crushbone you kill crushbone orcs. Their main faction is crushbone orcs. So by killing them you go kos with them fast. However, you also lose Indigo brotherhood which is ONLY the warrior guild of innoruuk (no dark elf guards, though people ALWAYS mix that up.), an ambassador in the basement of the maiden's fancy, Dorn in Nro and possibly some other lower npcs I left out.

This makes dark elves think they can't kill in crushbone, but they CAN. Since indigo is not the primary faction the cb orcs are on, you can kill them billions of times and still not get kos to indigo brotherhood. Now, if like my cleric dark elf you kill Dorn a whole bunch (with his primary being indigo brotherhood), you will then go threaten faster with indigo brotherhood even if you then only kill orcs in CB. She is now threaten to indigo, but she killed Dorn A LOT to raise primordial malice (then they removed the primordial malice npcs from Rathe mountains, making this moot!)

The main npc I remember not on Firiona Vie is on some epic quest faction, a high elf looking enchantress or something in a hut in the city. My wood elf druid was dubious to her. I think nearly everyone else is on the FV faction.

The reason that the SK iksar can't raise it anymore, is that he has a much lower max with that faction. I can't remember if it is because he started out at more than -2000 or what, but he can only raise it so high.

An example of a faction max is that my wood elf druid can get to allied with stormguard (dwarven guards) before "maxxing", as in "you can't get any better with stormguard." Meanwhile, my dark elf cleric is at warmly, but can't get "any better with stormguard."

In the iksar sks case, max for him is still scowl. However, he could probably use a form change potion and not be kos. I'd try a human form potion.
Wolf form DOES make you kos there for sure, so don't do that (actually wolf form lowers your faction by some amount, so if you were a druid and warmly to FV you'd probably not be kos in wolf form.)