Yes, a Runekeeper is a "Glass Cannon"... true..

I like to drop a heal stone, then a lightning stone (that will distract 1 or 2), while you fight the 3rd.
Solo is possible with a lot of stealthing around (not actively fighting everything, and walking cautiously)

then knowing which of your spells do the MOST damage and using those first.

Also, know which spells you can cast while MOVING around. Keep heals ready, a potion ready, and a heal stone ready and you will live.
Try grouping whenever possible.. find someone in the area and ask to group. most people will if they are already doing that quest.

g/l !!