There is no Diplomacy level requirement to engage in Diplomacy with any NPC.
Originally, it would have required that your Diplomacy level be at the minimum 5 levels below the target's to engage in Diplomacy (example: you having 5 diplomacy is enough for a 10 diplomacy npc, but 4 is not).
Furthermore, this is exploitable for rapid Diplomacy exp gain because higher-level Diplomacy NPCs give MUCH more exp, despite not necessarily being particularly harder to defeat.
server_id: 1
server name: New Telon
chunk: Isle of Dawn (1)
location: -37187 -23493 2130
severity: Severe (e.g. Exploitable)
reproduce: Every time
updated: 2021/04/27 07:50:39
assigned to:
Type:
Priority:
Fixed By:
Unassigned
Content Bug
Unassigned
Dev Notes
Entered on Apr 27, 2021 07:04 by Jakkal This is scheduled to be fixed soon but as of this report it has not been implemented yet.