Phantom lancer is so horrid late game it's not even worth trying... He stormed 3 towers pretty much on his own during the match and single handedly killed our team at one point :S
What immortal chest was it?
If you are with a decent ammount of friends,
go Medusa.
I use her 4 tank 1 dps build, and it works wonders if your team can either push or somewhat not feed and hold their own for at least 30 mins. Yes, it will take time, a lot of time for you to get to the point where medusa is an unstoppable force, but after Manta you can start to split push with Split Shotting illusions and after a Skadi you will pretty much not die in an encounter or gank. Satanic is the next item since it gives you a lot mroe hp and that ridiculous lifesteal. After tat, get a demmon's edge and see if the other team's main carry went MKB/Butterfly. If he didn't go mkb or butterfly, get a butterfly and a Divine. If he got either one of those, get a MKB instead of the rapier and decide yourself if you want evasion or 300 dmg for the alst item. I like to get Travels after Skadi myself.
And ffs, dont go linkens unless they have a batrider or something, it is seriously not worth it and your're getting your first big dps/tank item delayed by over 5k gold, which will take a long time to recoup until you get another item like manta or skadi.