Level 400 Exotic Weapons
Commander Ahria – Warrior – Stormbluff Isle
you can check this out, has pretty good list of named exotics you can craft using the mystic forge:
http://wiki.guildwars2.com/wiki/Mystic_Forge/Other_Items
is this what you’re looking for?
if by level 400 you mean weaponsmith/artificer/huntsman, there is the default exotic you can craft by them (e.g. pearl weapons via weaponsmith) and you need to get the recipe for the inscriptions from the NPC of the corresponding craft.
in addition, here are a couple i know off top my head:
Destroyer weapons http://wiki.guildwars2.com/wiki/Destroyer_weapons
Corrutped weapons http://wiki.guildwars2.com/wiki/Corrupted_weapons
Akaimon | Jolly Good Guardian
Akaigi | Warrior Made of Wood
[CDS] – Sanctum of Rall
Akaigi | Warrior Made of Wood
[CDS] – Sanctum of Rall