This was a grade-11 Dissolution Spell that was originally meant for mages to deal with a powerful True Might at close range. Saleen throwing it at the peak of the warehouse was purely wasteful.
However, without a grade-11 magic spell, this warehouse would really be difficult to open up. Saleen did not have the time to go and analyze this magic lock. Alchemy City's magic locks would definitely be grade-11. If they were to calculate things by the book, Saleen alone would still have to spend a few hours on it. A few hours' time would probably be sufficient for Alchemy City to summon even a grade-13 creature.
Alchemy City was not like the forces of some small nobility. There were more than 10,000 mages here. In Alchemy City, those below grade-4 were not considered mages, and only those who surpassed grade 4 would be honored with that title.
The actual number of mages in Alchemy City was estimated to be between 800,000 to 1,000,000.