"This is a walkthrough for the level Cortana, structured for play on Legendary difficulty with notes for lower difficultiy levels. Cortana is the penultimate level of Halo 3, and arguably one of the most difficult of the franchise. Your mission as stated is to find Cortana on the High Charity, free her from the Gravemind and eliminate the Flood. Your most valuable pieces of equipment in this level are Deployable Covers and Bubble Shields. Cloaking is also handy but extremely rare. It is recommended that you always have a Deployable Cover with you. Grenades are also your friends here; Plasma grenades are very effective against Flood Ranged Forms and Flood Carrier Forms, and Fragmentation grenades will thin out large groups of Flood and bring down shields on the Elite Combat Forms. Most of the Combat Forms on this level are either Brutes are Elites, with very few Human forms appearing in the level. Beware, though: if you have bad aim, you will be penalized in this level. Flood Growth Pods line High Charity's walls and if you are inaccurate you will unleash torrents of Flood Infection Forms that will make you waste valuable ammunition and probably kill you. Once you've killed all the Flood Combat Forms in the room, destroy their bodies so the Infection Forms will be unable to revive them. Using Skulls on this level is not a good idea for inexperienced players, but using the Catch skull provides you with a distinct advantage, as the Flood do not use grenades, but upon death, they will almost always provide them with this skull active. If using Co-op, the Arbiter starts off with an Energy Sword and Carbine. This is perfect because even when the Arbiter dies, he will respawn with these weapons, perfect for any use, including for dealing with the Pure Forms and Combat Forms that are highly abundant in this level. If John-117 dies on Co-op, he will start with a fully loaded Assault Rifle and Shotgun. __TOC__"@en . "Cortana (level)/Walkthrough"@en . . "The Covenant"@en . "Halo 3 Campaign Walkthrough for:"@en . "This is a walkthrough for the level Cortana, structured for play on Legendary difficulty with notes for lower difficultiy levels. Cortana is the penultimate level of Halo 3, and arguably one of the most difficult of the franchise. Your mission as stated is to find Cortana on the High Charity, free her from the Gravemind and eliminate the Flood. Using Skulls on this level is not a good idea for inexperienced players, but using the Catch skull provides you with a distinct advantage, as the Flood do not use grenades, but upon death, they will almost always provide them with this skull active."@en . "Cortana"@en . "Halo"@en . . .