Blade Spirits are geared to track and attack warrior types. Similarly, Energy Vortex tracks and kills mages and other characters with high Intelligence. Blade Spirits and Energy Vortex can have a devastating effect in a crowded room. Stand near the door, casting one of destructive spells, then trap your opponents in the room with Magic Lock or Wall of Stone. The field spells double as both offensive and defensive weapons.
Most monsters tend to shy away from fields.
If you can cast Mark, it can provide a quick teleport getaway in an emergency. From your home, cast the spell on an object small enough to carry in your backpack. It will record your exact location. You may want to cast Mark on several items, just so that you have several safe points to which to escape. When you make yourself invisible, you see yourself as a gray apparition on the screen.