The overall quality of your reward is determined by your team's effectiveness in a particular dungeon, here-on-in referred to as TE, and your associated Player Growth Attributes.
You can receive the following types of rewards by adventuring:
 Player Growth Attribute. This optional will be unavailable until you complete Episode 5.
 Player Growth Attribute. This optional will be unavailable until you complete Episode 5.
   Player Growth Attribute.
 Player Growth Attribute.
   Player Growth Attribute.
 Player Growth Attribute. Player Growth Attribute.
 Player Growth Attribute.
   Player Growth Attribute.
 Player Growth Attribute.
  you will get.
 you will get.
   Player Growth Attribute.
 Player Growth Attribute.
   Player Growth Attribute. Note that this feature is still in development.
 Player Growth Attribute. Note that this feature is still in development.Like usual, all Player Growth Attributes are boosted by their related Credit Shop Key Iems.
Here is a list of what determines your party's TE and by how much:
Please note that 100% TE does not guarantee you a reward.
Additional information regarding what rewards you will acquire from adventuring are available to owners 
of the Credit Shop Key Item 
Batnoculars 
 .
.
Without the Credit Shop Key Item 
Adventurer Map 
 you will be limited to 
dungeons you currently have access to when adventuring.
 you will be limited to 
dungeons you currently have access to when adventuring.
While your creatures are adventuring, other players will be able to hunt them. If your adventuring team wins while they are under attack, they will receive a small 5% boost to their TE. If they fail, they will suffer no penalty at all. Please note that the maximum amount of TE an adventuring party can build up when they are under attack is 20%.
 You can improve your party's ability to defend itself by increasing the Player Growth Attribute Adventurer  .
.
You can read more about player hunting right here.