Reaper Walkthrough. ★ Season 1 Roadmap | Full Zombies Season 1 Guide! ★ Wonder Weapon Rarity Glitch for dealing more damage! Reaper is an Act 2 mission in Call of Duty Modern Warfare 3 (MW3) Zombies. Read on to learn more about Reaper objectives, and Reaper rewards! These are all of the weapons and items that you can find during Modern Warfare 3’s Highrise mission. Weapon & Item Location. Weapon & Item Name. .50 GS. Anti Armor Rounds. Explosive Crossbow B0r4f.