The combo for the puzzle for Rainbow in the Dark is think of it as a clock.
click center then click
10 o'clock
8 o'clock
2 o'clock
4 o'clock
6 o'clock
12 o'clock

Have lightning resist on when you are doing this.

Enjoy your loot!

Have done this twice successfully. Isn't random.

Brieana (Guild = Oblivion)