Guild Wars 2

I thought I saw a mob earlier today with a Hall of Monuments weapon. Was I mistaken? Has anyone seen something like this before?

Lore-wise, only a player character should possess these items, right?

Depends on the weapon.
From GW1 many replicas of Sohothin and Magdaer was made, the Fiery Dragon Sword, so I see no problem of a few being lost cross the world and random mob find it.

lore wise these items are not characterbound.

if you go into the HoM you find a ghost telling you, that he hold onto these items from past heroes.

If you are worthy you can get them and that is the only “lore” we were giving to these items (aside the extra fluff that is alocated to these items seperatly)

In no way the lore states that you as a player (of GW1) are the only one to get these items.

You might see enemies using the items, you can get there, however that might not have the “lore” influence you are thinking about, but mostly an artistic choice.

Though it might help if you tell us which mob it was you are refering to. maybe there is a lore reason behind it.
Other then that it is “just” artistic freedom

Certain Inquest members – I think engineers – have Diamong Aegis. Naturally Rytlock has a fiery dragon sword. Mad King Thorn has a one-handed Fellblade.

Beyond that I don’t recall any NPCs with HoM weapon skins but it wouldn’t be too surprising if they did. It isn’t like they’re restricted to the PC in lore anyways.