Not sure on the chance of both in one hallway, since the chance of a Thing being in a particular hallway is dependent on the number of hallway tiles in the dungeon (whereas Collector replacement is rolled each time you enter an encounter tile). Collector is 3/4/5% chance of spawning in apprentice/veteran/champion, but only if your inventory is over 65% full. This will also occur in the Wolves at the Door mission.IIRC, if a region shows that the Thing is present, there is a 50% chance it adds a Thing encounter to a random hallway tile. If retreating with more than one party member, one member must sacrifice themselves in order for the rest of the party to retreat safely. Abandoning from the Darkest Dungeon can be harsh.Heroes are more likely to develop negative quirks upon retreating.

Heroes will not receive a resolve check when they reach 100 stress from this action. Heroes will suffer 20 stress after abandoning a quest (which is unaffected by stress modifiers like trinkets, quirks, and torchlight).Abandoning a quest will always be guaranteed, but similar negative effects to retreating will occur: You can only abandon a quest when your heroes are out of combat. To abandon an expedition, click on the 'x' button on the top left corner. You cannot retreat from a battle if your party is surprised.You cannot retreat from the Shrieker, or from the final boss.lured by the Siren or being cooked by the Hag) will not retreat with other heroes, and will instead suffer a deathblow. Wandering bosses like the Collector will reappear when your heroes enter the same hallway battle that they retreated from.Retreating from a hallway battle will leave your heroes in the previous room they were in.They will all need to back track in order to move back into a safe room. Retreating from a room battle will leave your heroes in the hallway that they used to enter the battle room.In practice, the amount can be much higher due to stress modifiers like torchlight, death's door, or being underleveled, so be prepared for potential afflictions and heart attacks. Heroes will suffer 25 stress after a successful retreat.There are few things to keep in mind before attempting to retreat: Retreats are not guaranteed to work when desired (if the option is enabled) and will act like a turn skip (70% to succeed the first time then +5% for each other attempt). You can only interact with the retreat option when it is your hero's turn to act in combat. To retreat from battle, click on the white flag on the top left corner.

Collector fight darkest dungeon