Here are screenshots of the KR Maps to show path to take to get to Melissa in the Wisp Dungeon.
Yellow Dot is where you enter, green line path to take and Red Dot is where will exit.
First will take Moongate to Honesty.
Follow this path through level 1:
Quick drop and short walk down stairs:
This part is dangerous as Evil Mage and Mage Lords and Dark Wisps all around so be ready to run. When get to the red dot you will be standing on a stone altar/pentagram say the password - martoovehlkxrisspince
Do Not step on the red altar shown below it will dump you out, the portal on north wall will take you in to challenge Melissa. She can only be summoned every 15 minutes and anyone must say EORED in the center to summon her.
Hope this helps anyone that hasn't been or gets lost along the way.