I think that the undead curse was caused from lord gwyn linking the first flame to humanity

And londor sounds like londo, as in new londo, home of the darkwraiths

It's also similar to "Londo" as in "New Londo". Considering that is where the darkwraiths who used this weapon were born and Londors apparent reverence to the dark and it's powers perhaps Londor was named after New Londo? Maybe it was even built upon it?

From other item descriptions it seems that Londor is the "land of the hollow". Lordran is referred to as "the land swallowed by darkness" and Drangleic is yet to be referred to directly, but vendrick is addressed as the "Old King of Want" so name probably will have to do with "want". Londor, from what appears to bubble to surface, is not lordran or drangleic but kinda both and more. The trailer did say after all that it was a transitory land where the lands of the lords of cinder converge to one.

it's been at least a thousand years (i think) story wise, and also i've noticed that the general story seems very familiar, what with the knight that went and fell to the dark powers, hell his sword, lorian's greatsword, looks very similar to the abyssal greatsword from DS1 (i.e. missing half of it's guard and a beaten, only real difference is that one is all burn-ey and red, and the other is shadowy and black)

According to the weapon art it steals HP now to heal it's user and harm enemies.

I've done some pretty extensive farming on them and I can confidently say they do not drop the hand. Around 5 of almost everything else from them has dropped for me bit still no dark hand

They now steal life from human enemies and give you life from it

Got to be players

Don't know if you're still looking, but it's ok. There are far better options, however.

It only works on other players