Fawkes Harry Potter Basilisk. All of these moments serve to emphasize how Harry could not defeat the snake or Tom Riddle alone. Wizards Unite and can be found in the Hogwarts School registry.

He comes back from certain death. He had been loyal to Dumbledore for many years prior to the Headmasters death in 1997. Wouldnt they have also been effective against Naginis venom.
It is only with Dumbledores support that he is able to find the strength within.
Dumbledores phoenix punctures the basilisks yellow eyes and blinds the king of serpents. It is unknown how long Fawkes had been in Dumbledores service. Fawkes later uses his tears to negate the basilisks venom. He gives Harry the sword of Goderic Gryffindor and he kills the basilisk.