Old School RuneScape uses the British convention for floor numbering: Ground floor, first floor, etc.
Wizard Mizgog chathead

Wizard Mizgog is a stuttering and clumsy wizard found on the 2nd floor[?] of the Wizards' Tower and the start point of the Imp Catcher quest. After the quest he will trade a complete set of imp beads to players for another amulet of accuracy.

In general, he seems to be rivals with Wizard Grayzag, who is across the hall. A keeper of magical trinkets, he is often bullied by Wizard Grayzag, a devotee of slightly 'grander' and more destructive magics. Trying to keep to himself won't work as across the hall, Grayzag is always plotting another nefarious scheme against him. When asked whether he could teach the player "any interesting spells", a surprised Mizgog will reply that he does not think so, as he says, "The type of magic I study requires years of meditation and research."

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