What was Frodo's temptation

[Mnemosyne]

Originally Posted by narfforc

What promise did it give Isildur?

It's weregild. Isildur took it as payment for the loss of his father, brother, and Numenor.

So any promises along the lines of restoring those losses would have been very well-taken, though you'd have to be pretty deluded to think you could raise the dead, Ring or no.