Halo............

Fleeing into Slipspace at a seemingly random vector, a UNSC warship brought with it what was believed to be the last remaining Spartan, the Master Chief. As they arrived in a remote, uncharted region of the galaxy, they suddenly came face to face with something they had never before seen —Halo.

This prodigious discovery was marred when the Covenant, attempting to activate the ring to fulfill their specious prophecies, mistakenly released a strain of the Flood that had been contained within the installation for a hundred thousand years.

In response, the Master Chief was forced to uncover the secrets of the Forerunners' extinction and a stratagem to prevent the parasite from escaping. With the fate of the galaxy hanging in the balance, he destroyed Halo, ending the vast threat it possessed and destroying the Flood's infestation along with it.

did it destroy all of the flood or just a large quantity of the species?