elp for all single players:

in a bunch of missions you need to carry stuff throw maps, like statues, mechanic stuff and others. Normaly if you carry stuff with your character, he/she moves slower. If you been beaten by spiders or zombies you can be poisend. If you poisen you can carry very quickly so in this missions where you carry stuff you should be poisen to end these missions more quickly ^^

If you play single player, rent fighters insteadt of thiefs or socceres, because fighters are more helpful towards monsters in every mission. And espacially in higher missions, you will need them!!