Set the dungeon difficulty of the Encounter Journal. 
List op usable IDs: 
- 1: (5) Normal
 - 2: (5) Heroic
 - 3: (10) Normal
 - 4: (25) Normal
 - 5: (10) Heroic
 - 6: (25) Heroic
 - 7: (25) Raid Finder
 - 14: Normal
 - 15: Heroic
 - 16: Mythic
 - 17: Raid Finder
 - 23: (5) Mythic
 - 24: (5) Timewalking
 
See also _(API_CAT_EJ).
Signature:
EJ_SetDifficulty(difficulty)
Arguments:
difficulty- The numeric ID of the difficulty (number)