Idk. Only liked halo CE. But I liked it's story and the level design. Didn't dive into the lore beyond that. So to me. Covenant are meg, only 1 spartan exists because all the others died, and the flood are standard zombie like infection that learned. To use guns. With the most insanely joking of method to infect things. Balloons that pop each other if you shoot one while they are close to each other. So beyond that. Nothing.