"Well, if the mist isn't generated magically then dispel attempts would be fruitless. Perhaps I could summon an Air Elemental and direct it to assume whirlwind form? That would clear out the mist. However, it would also consume the scroll and prevent us from using it later." Darian then looks to the others, as he unfurls the Summon IV scroll. "
Unless someone has a less wasteful plan, then prepare yourselves. There may some turbulence, so make sure your scrolls and books are securely fastened."
Darian then reads from the scroll, letting the runes sizzle from the parchment. When the Air Elemental appear, he orders them in Auran to clear away the mist in fastest manner possible.
[1d3 Small Air Elementals to summon. I don't have my MM so I don't know about their whirlwind form.]