Sreth
Sreth turns and wheels his mount to survey the tower. He begins to fly in a slowly descending spirals around the fortress. He activates a few spells of seeing to assist in his survey of the towers defenses.
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Casting True Seeing, to begin to survey the tower.
He begins at 1000ft out and circles the tower at 1000 ft then 900 ft then 800ft, etc. on down to 200ft if nothing pops up. Anything not currently hostile in noted and passed on to the group, the search goes on until 100ft is complete or something hostile happens.
He is looking for wards, runes, etc. Any sort of offensive/defensive magics or creatures. He is also looking for entrances/exits/windows/arrowslits/etc.