Spoilers request - hidden maze's wardstone Options

[GotWangi]

Hi all, need a little spoiler with this part of the mod because at this stage I feel like my head is about to explode. So I finally mapped the dungeon (or at least I think so), but just when I thought I'm at the final room, I get a message that I need some sort of ward to access the lower level. There's also another room I believe that gives a slightly different but similar message. Does this mean I'll need two keys ?? Anyway I went back and explore the dungeon again, making sure I check all the pools. 1 hour later and I'm still searching.

So to make long story short, can anyone spoil me on where the required thing is ?

[GotWangi]

OMGGG!!!!! I feel so stupid. I knew theres something special about that one-door room, but for some reason I managed to miss that cave/extension thing for so long. I finally managed to go face-to-face with the dracolich, only to get totally obliterated. I guess this will have to wait until I get a few more levels. Thanks a lot!

As for the map, I basically just draw a circle for each room, and wrote a note down on the monster type or if its empty whatever random item I dropped to mark the room. I then start linking the circles with lines marked with a one way arrow. Red for the forward exit and black for the backward exit.