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Ok I have a problem.

I am at the last main quest, the place where Alduin gets to Sovengard to feed on his victims. I just went through the inside bits, I assassinated everyone there, but outside await me two Deathlords.
For the love of god I cant sneak past them. They detect me so fast and from such a far distance! I am a thief so there is no way im getting in an open combat with them, a thief has no chance against them (2 of them )
I have 100 in sneak, I dont see why they detect me so fast. I can sit 3 meteres away from any other monster in the game and they will not see me but these fu**ers do. They take like 15-20% of my HP in one hit with dragon light armor on upgraded to legendary.

How do I get past them or clean out the place?
Is this a bug that they spot me so soon or is gamesas basically saying, [censored] thieves well make it impossible for them to sneak by in this place, they need to fight, who cares that daggers do crap all if your not in sneak.

I have 100 sneak, all perks and ive tried everything. There are times when they dont detect me so I try to kill them but they constantly move back and forth so as soon as I hit they take one step forward and get out of my range and then detect me and next thing I know I have two deathlords on me.
I tried paralysis poison, doesnt work, and even if so I only got one so I cant use it on the other deathlord.
Please share your tips on this quest. its starting to majorly annoy me and im starting to hate thieves for their lack of power in open combat. Might reroll as mage or full on warrior.

Use unrelenting force...line them up and blast them off of the cliff and then run away

Yup, agreed. Skyrim is just that easy.

Do you have a muffle effect on? have you tried distracting them with an arrow or Throw Voice?

yeah like already said.... you can't take on someone, but also can't avoid fighting him?

unrelenting force and just move on

I actually just took them on this time:P Switched my main weapon to an axe and somehow managed to only pull 1 guy, then [censored] the other one up

Have you got Elemental Fury? I am using two war axes and with that shout, I can slay an Elder Dragon in less than 7 seconds. Draugr Deathlords are no problem either.

As others have mentioned, FOOS RO DAH! off the cliff, or if you have it, which I'm assuming you do, Use Ice Form on them and take them out one at a time.