Vanyel does. He gets them out. They're not in a language Maitimo can read, but he can translate.
Fifteen weapons. They have varying amounts of information on what they can do. Vanyel is only confident enough in five of them to even guess at how they'd interact with Arda and its magic.
Weird cow skull and jewelry weapon. Unsure what it does. Nope.
One summons a vast number of Abyssal demons (mindlessly hungry, incredibly dangerous beings). Probably not worth trying. Vanyel isn't sure that even an infinite number of demons can take out Melkor, and the collateral damage would be...high.
This one sets off a mundane fireball. Not really any better than a Final Strike, especially since it needs someone to trigger it and that person is inevitably going to die. If they thought a big enough explosion would take Melkor down, Vanyel could try triggering it and calling a Final Strike at the same time, in hopes that it would stack. But...not a first choice.
This one releases purely magical energy. That - might hurt Melkor a lot. Buy them time at least. It also leaks enough at the material plane, in the form of white-hot fire, that the caster is inevitably dead.
...Oh. And this one, Vanyel isn't sure he understands the notes fully, but it looks like the opposite of an explosion. Sucking in all magic in its surroundings. Probably via something akin to a temporary one-sided Gate opened directly to the Void, scaffolded on the weapon's design so it can remain stable long enough to do some serious damage. Possibility?