I remember the secure house. Boy did I have a tough time soloing it,
right of the bat if memory serves you fight a fire spider enemy (note: the majority of enemies in ther are fire), then you fight 2, then a couple floors down, 3 enemies (2 fire, one ice).
It's a very annoying instance, but you do get to see a new kind of floor layout on the final floor of the gauntlet (really the only time you get to see it from what I know)
What I reccomend is try to focus on one enemy at a time, then when your down to one enemy, try to take your time and heal as much as you need. At least, this was my strategy.
I hope I helped some.
p.s. summoning minions/henchmen wouldn't be such a bad idea, although I think I only summoned 1 henchman and that was on the final floor.
Good luck.
Seth ShadowCloud Grand fire/storm Machine Master (beat K. Park) former pvp veteran a good friend
Seth EmeraldFlame Initiate (lv.14) myth former pvp knight a good friend