How to Darken the Diabolical Altar - East Dazzling Room in Find Mii II

The Diabolical Altar - East room in Find Mii II has a dazzling light when you first enter it.  In order to get rid of the dazzling light you need to use a Mii with a black shirt.  The Mii will automatically use their Black Magic to make a shadow block the dazzling light.  One blocked it stays normal, so you do not have to beat the room right away and can come back later with other heroes.

Note that this room has a mummy that will often scare away the first hero in the group and the armored ghost will take the damage if you try to attack mummy, so you are forced to kill him first.  Additionally, the mummy can heal the armored ghost, so you might want to hire some higher level old allies if you do not regularly gather high level Streetpasses in a row.