Ok. I'm not sure what school should get it but Balance Myth or Ice are probably the best choices. So, it's Summon Wisp. You know those protection pox things in ds? This spell summons one of those for you ! They would have decent health considering it would be given to 100+ wizards but all it would do is shield. It's spells would include all school shields, elemental/spirit shield and tower shield. Most likely it would be random.