Ok, I amm in the Planar Sphere(beat the golem)

and ***SPOILER***
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I am against the halflings. Any advice?
My party is:
Me(Kensai)
Minsc
Valygar
Jaheira
Jan
Aerie
Also, Jan has the Cloak of Displacement. Will he be able to cast Invis or Im. Invis and get past to backstab whatsherface, the mage?
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Sword Saint of the HADB Clan
Waitress and entertainer at Cloudy's Cafe
Lil' Angel