npc summons are only available in front of some boss fights and some require questline progress to be available
bleak hornet
npc summons are only available in front of some boss fights and some require questline progress to be available
beyond that you just have to be embered to see them
fleet frost
to summon to help with an invader, it is not npc’s. those are certain covenants
quiet bough
Londor's pale shade sign in farron keep isn't in front of the fog wall 