Helen is definitely right about 'agony aunts', since the term is evidently a play on "Kummerecke" (or by extension to the "Kummertante" counsellor featured there).

But since the fellow's a magician, I thought I'd add a pertinent alternative.
Or if you don't mind something less literal, but even more fitting (and snappier IMO):
Wise Words from the Wizard

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Note added at 18 hrs (2009-09-25 11:17:57 GMT)
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Re wizard: I had overlooked that this magician is an "aunt". But, as Helen has suggested (see discussion entry), using it as an adjective seems fine, so I'll change that to:
"Wise Words from a Wizard Witch".