Ruin Explorer
Legend
I should have mentioned it will be level 1 to 6.
1-2 may be pretty fatal/terrifying w/o any ability to rescue people with spells (people going down in round 1 will be the big issue - round 2-3 they'll usually be save-able). 3-6 should be fun.
Re: CON score + CON mod HP at L1, I'd consider revising this to CON score (perhaps -2) + half HD HP myself (rounding up), because otherwise a Rogue will gain a massive amount and a Barbarian might gain barely anything. Unless that's the goal for some reason.