For Barnabus' cave there are 2 teleporters you need to take (one on the ground level and one mid level on a ledge) that contain generators that need to be disabled, and another teleporter on a high ledge you should explore before going after Barnabus.
Svadilfari is in a cave in the Red Hammer Tribe area, in the southern section with all the destructible goblin houses and fortifications (the entrance is above where they were, on the mountain with a bit of a clearing).
