This is good info! I was wondering of somebody, somewhere had done these tests. If you're still looking to add information:
- Homing Soul Arrow will fire at enemies even if they are not visible to the caster.
- Most (if not all) items that create a symbol under your Endurance bar (excluding the fog symbol that represents stealth) also create an aura around your character, making you visible to other players as a small, moving light.
Ask my anything. About Magic, that is.