Party System (MMOCore)
The plugin integrates automatically with the MMOCore party system:

• Automatic Detection: The plugin detects if the target player is currently in a party
• Shared Visibility: All party members are able to see the mob
• Shared Targeting: The mob will attack the target player or any nearby member of their party
  
  
• Dynamic Updates:
  • If someone joins the party They see the mob and can be attacked
  • If someone leaves the party They lose visibility and the mob stops attacking them
  • If someone reconnects Their status is correctly restored based on their party membership

Exclusive Targeting (Party)
The mob attacks only the specified player and their party members. Players outside the party cannot be attacked, even if:

• They are closer to the mob
• They attack the mob
• The target player is far away

️ Visibility

• Shared Access: Only the specified player and their party members can see the mob
• Complete Stealth: Other external players cannot see the entity at all; it is completely invisible and non-existent to them

The command is them same

Tested:
1.21.4 Paper-1.21.4-232
MMOCore-1.13.1-39
MythicLib-dist-1.7.1-62
MythicMobs-5.11.0-SNAPSHOT 5572