I've got the three keys and I've put in two and defeated the guardians to the keys but I can't beat the final one...The one with the Nymph, Hive Mother, some drow and other fighters, and one other creature...Any strategies or tips for this fight would be appreciated.

P.S. My characters levels:

My(Half-Orc Fighter) Lv. 21
Minsc Lv. 19
Jaheira Lv. 14/14
Imoen Lv. 15
Aerie Lv. 15 cleric/14 mage
Edwin Lv. 18

Extreme buff spells, overkill attack magic and insane fighters.

Use the portal to skip out between kills. Ive never been able to do this one in one go. Ever. I usualy start with the rightmost, weaker , targets and down them one at a time, skipping through the portal to rest and rememorise as i go. Leave the hive-mother and the marilith till last since they require breach and ruby ray to be effectively attacked.

shield of balduran against the hive mother

vhailors helmet for yourself (simulacrum 1/day) - extra fighter

(and any other item you can use - Ring of the ram etc.)

chain contingency with 3*Horrid Wilting (if Edwin has it)

Lots of summoned monsters

improved haste (and any other 'buff' spell you can think off)

Position the party on the 'weaker side' of the enemies and let the simularcrum and a few of the summoned monsters 'hold' the other side. Kill the three on your side (don't let the druid get her spells off) and work your way across.

hope this helps

i beat them easily when i summoned some swords by my side and went to a safer place. cast some clouds while they are busy with those sowrds. good luck

you might condiser getting a good thief...Imoen sucks with traps, but use her if you must.

One spike trap instantly wiped out the exteremely annoying baddie that appears in the upper left hand corner. A few regular ones had the 6 armed one to "near death". Keep lowering their defenses with magic.

Retreat to the room with the door, close the door before the bad guys get there. They aren't smart enough to open doors. You can even rest.