Halo 3 (MCC): Cortana Legendary No Skip No Glitch No Death with Iron & Thunderstorm Skull

Others said that this is the hardest level in the game and I can see why but at the same time, it isn't. Not with the tools given to you throughout the level. More than enough Plasma Rifles and Energy Sword is given to you and both of these weapons are Flood Killers. Gravity Hammer as well but only to Combat Forms. So with that said, the only thing that needs to be done is to take your time bombarding them with Plasma Rifles, be aware of where the enemies are and be on guard in areas with them.

Biggest Threat here? Rocket, Shotgun, Mauler, Brute Shot and Plasma Rifle Flood. That's a lot I know but they are definitely more dangerous than multiple Ranged forms. Reason is very simple.

While there's only 1 Rocket Flood in Cortana, only spawning in the area at 4:35 (Which is why I was very cautious in this part of the map. Idk why it's not here this time though. Maybe I naded it), due to how large and how much flood is in this part of the level, You might have trouble spotting where is it much less killing it, which would then give it enough time to shoot even a single rocket. I don't need to tell you what would happen if it does shoot one out.

Shotgun and Mauler Floods are very capable of killing you in one shot at close range but any other range it will not be a threat. Still, I recommend taking them out when you are able as the Flood as we all know it love to get close and personal in a very quick pace.

Brute Shot Flood is dangerous for the same reason as why you want to take care of a Brute holding a Brute Shot first. Nothing new here. Plasma Rifle Floods are insanely capable of taking your shield completely down within a second. Follow that up with even a Spiker Flood will end up killing you in 3 seconds in total.

So why Ranged Forms are not in the list? Easy. They are going to be stationary if they are to assume this form. Therefore you can think of them as some sort of Turret placement instead and what they do will be simply just restricting your play area without getting shot. Of course, this actually does a lot more damage to you than how I put it here as this level is mostly a tight squeeze. But in comparison to incoming dangers that can walk or run towards you, I believe that Ranged forms are just not as dangerous as most think.

Oh and what does the Thunderstorm skull do for the Flood? It spawns a lot more Elite Floods. The only flood form to have a Shield.