(Psi)SeveredHead
Adventurer
If the GM had followed the rules as quickly as possible, they would still have to change the NPC.
A 24th-level warlock would have at least three encounter abilities, three utility abilities, and two dailies, not to mention the warlock-specific abilities (cursing, sorcerer-king pact, etc). That's quite complicated to run, at minimum. But said NPC would have been balanced and had decent but not crazy hit points.
Alternatively, the DM could have created a "monster", although they could have made them a standard 24th-level monster with warlock templar-themed powers.
Unfortunately, that's not what your DM did. The problem here was not the rules, but the DM. They showed a lot of favoritism toward a single player, effectively promoted a PC into a super NPC (probably a solo, hence the ridiculous hit points), gave them a ridiculous artifact and then had them betray you. That's got nothing to do with the rules as written.
A 24th-level warlock would have at least three encounter abilities, three utility abilities, and two dailies, not to mention the warlock-specific abilities (cursing, sorcerer-king pact, etc). That's quite complicated to run, at minimum. But said NPC would have been balanced and had decent but not crazy hit points.
Alternatively, the DM could have created a "monster", although they could have made them a standard 24th-level monster with warlock templar-themed powers.
Unfortunately, that's not what your DM did. The problem here was not the rules, but the DM. They showed a lot of favoritism toward a single player, effectively promoted a PC into a super NPC (probably a solo, hence the ridiculous hit points), gave them a ridiculous artifact and then had them betray you. That's got nothing to do with the rules as written.