You are asking for an awful lot of help on this level subkel. Most of these rooms can be completed with practice and a bit of trial and error.
I didn't do too well in this room but the following works when entering from the east:-
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×Don’t bother with being invisible and take the potion immediately. Move five squares west and kill the five wraithwings in the south.
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×With sword pointing NW move NE then E and hold a wraithwing at bay until the snake dies.
See above for help on getting the final wraithwing - for many the most troublesome part of the room.