Each playable character has different strength in the begining.
Also, each has its own ability.
Royal Knight : Ignores equipment requirements.
Forest Hunter : Heal when poisoned.
Popular Merchant : Enemies drop more items.
Innocent Prisoner : High strength, and don't get hungry often.
Hunger undermines strength of explorers.
Hunger can be removed by eating/drinking something.
Meat, fish, egg, mushrooms…There are many kinds of edibles in hell. Delicious food gives an explorer special effects however, eating poor diet effects an explorer's preference.
When an explorer dies, a soul remains at the place of its death.
To collect a soul, another explorer with Death Contract has to go back to the point.
Therefore, it is not easy to collect a lost soul.