I don't know how you managed to get so fed like that, if Ashe/Vayne/Rammus had any sense they could have..
1. ashe ulted you for at least 2 seconds, with the survivability you have ashe could have killed you in like 3 secs if she wasn't stupid.
2. rammus, being an incredibly tanky hero even just with defensive curl, could have tauned you, rendering you useless.
3. vayne > ult > roll invis > pin to wall, 3 hit.
Then again, judging by their builds.. i don't see that happening.
also just a tip, don't ever stack death caps, it's not even close to worth it for the price your paying.
also clarity is a useless summoner spell, run ignite flash on veigar and i guarantee you'll find it more useful.
if you have to use clarity, you're spamming your spells too much.