Grimrock

After having solved the second nonogram and painted it on the floor, I went downstairs to check the fight room. Two lava monsters were there. At this moment I right-clicked on Margonon's staff (I wanted to cast a spell but forgot my mage had the staff in hand) and the game validated the puzzle once more: two more lava monsters appeared instantly, the message showed again and the sound was played. So now I have an extra 'Key to Y.M. tomb' in my inventory

Backstory:
Three Coven Ants used to live here. They were young foolish insects who would hide their secrets on the far side of a chamber covered with protective symbols. Now the chamber is long-abandoned but the loot still lies on the far side.

Hints:
Trial-and-error will solve this puzzle. However the solution is different for each team that turns up - read the hints when teleported back and try to avoid replicating this.

Essentially, think what it means to be a female, spell-casting insect who likes to sneak back by themselves to where the loot is. They also hate wearing clothes and like looking at the sun when it rises, so facing may also important.

In the chamber below are two things that will help you navigate across the room should you not be a solitary naked insectoid female spellcaster.

PS: I've asked for a minor update on this for a future version, as currently even if only one person is alive in a team, the status of the dead comrades is also taken into account - which is just silly: if you want to be naked fro example, all 4 of you have to be to qualify, etc.

PPS: regardless of who you are, eg: 4 male rogue minotaurs for example, you CAN get across this chamber. Only some tiles depend on class, sex and race.

Blue Pentagon = only one hero in the party
Orange diamond = party must face east
White cross = hero must be poisoned
Red square = nothing special (or I'm already fulfilling the condition)
Yellow triangle = drop something on the plate

No boys ? My only surviving hero is a female...
Dress for success ? Wearing the 4 pieces of clothes found in the small room below ?
Buzz off ? ...

no boys: at present, even the dead count - this will change. your logic is valid: ie kill off all but the girls and you should be able to proceed.

dress for success: remove all clothing & held items to pass. again at present includes dead comrades - and again will change.

buzz off: only insects can pass. if you are of another race, then forget it. Again, counts the dead, again will change

red square: if I remember right - you need to be a magic-user:

Foundry,
Margonon's Fall,
Leki's Room,
Residence of Archmage
and One with Nothing...