thanks. i now realize these two dungeons are the burial mounds.
and the signs in each dungeon are for the other lever pattern.
that got me the 2nd amulet and then past blue glowing barrier to the four chests

if your teams have trouble with this part, its not necessary to split your team like that.. but it made for an interesting video.
just enter the first one, write down the pattern, enter the second, write down its pattern and pull the levers in the pattern from the first dungeon.
return to the first dungeon, fight your opponent with a full team then pull the levers in the pattern from the second dungeon. return to it.. fight your second opponent. then send someone back with the square amulet (which you got from that guy) to the first dungeon. enter the lower dungeon from both places and get past the wall.
of course, this is hindsight

but its how i'll do it on a re-play when i do.