Each level in Halo Wars has an optional objective where you are asked to kill a certain number of a certain unit type, such as killing 100 Grunts in the first mission, Alpha Base. Once this objective has been completed, the skull location will flash on the mini-maps for a couple of seconds, so it's important to watch the map as you complete the objective. To simplify this, the objective will have a counter that pops up every time you kill a unit of the designated unit type. For example, the HUD will show "56/100 Grunts Killed", when you have killed 56 Grunts for that objective the skull will appear.
The skull will not appear in its location until the objective requirements have been met.
You can press right on the D-pad after you have completed the objective and it allows you to see where its located.
Campaign SkullsLook Daddy! Level: Alpha Base
Special Objective: Kill 100 Grunts
Location: On embankment near the downed Banshee where last set of marines are found.
Icon: A skull marked with dummy.
Effect: When Grunts die, their Methane Tanks always shoots off.
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Grunt Birthday Party Level: Relic Approach
Special Objective: Kill 20 Jackals
Location: At the South end of Alpha Base
Icon: A skull marked with Grunt mask and pink party hat.
Effect: Grunts explode into confetti after killed.
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Cowbell Level: Relic Interior
Special Objective: Kill 45 Hunters
Location: In front of the main console where Forge and Anders are initially pinned down.
Icon: A skull covered with silver/digital camo.
Effect: Destruction physics magnified.
Wuv Woo Level: Arcadia City
Special Objective: Kill 50 Elites
Location: Very eastern part of the map near statue of man holding book.
Icon: A purple skull marked with a pink lipstick kiss on its head.
Effect: Scarabs shoot rainbow made of pure love. (this is a reference of Age of Mythology, where a cheat called wuv woo will summon a flying purple hippo with a top hat and lipstick, and when it flies rainbows are created, and it attacks by spitting out hearts.)
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Fog Level: Arcadia Outskirts
Special Objective: Destroy 5 Wraiths
Location: North west of map on top the highway near two buildings.
Icon: A light green mist covering the skull.
Effect: No minimap, final score will increase.
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Sickness Level: Dome of Light
Special Objective: Destroy 50 Banshees
Location: In the hangar just behind and to the right of the UNSC Base.
Icon: A green mist covering the skull.
Effect: All player units have 50% fewer hitpoints, final score will increase.
Rebel Sympathizer Level: Scarab
Special Objective: Destroy 10 Locusts
Location: Next to the power node to the west of the Scarab.
Icon: A skull marked with a dark green fist on its forehead.
Effect: Non-player units get 25% more hitpoints, final score will increase.
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Rebel Supporter Level: Anders' Signal
Special Objective: Kill 750 Flood Infection Forms
Location: On cliff edge beside a crevace in the northern part of the map.
Icon: Same as Rebel Sympathizer only the fist emblem is red.
Effect: Non-player units do 50% more damage, final score will increase.
Rebel Leader Level: The Flood
Special Objective: Kill 20 Flood Stalks
Location: By the downed pelican to the west of your starting base.
Icon: Same as Rebel Supporter only the forehead is flaming.
Effect: Non-player units start with extra veterancy, final score will increase.
Catch Level: Shield World
Special Objective: Kill 350 Swarms
Location: On the island in the south east section of the map (you need air units to reach it).
Icon: A skull marked with 2 baseballs on each side.
Effect: All player units recharge unit abilities in half the time, final score will decrease.
Sugar Cookies Level: Cleansing
Special Objective: Destroy 100 Sentinels
Location: North east section of the ship in between both platforms (you need air units to reach it).
Icon: Normal skull only it looks like a skull-shaped cookie.
Effect: All player units have 50% more hitpoints, final score will decrease.
Boomstick Level: Repairs
Special Objective: Destroy 12 Spirit Dropships
Location: North east section of the ship above the central structure.
Icon: A skull marked with explosion effects.
Effect: There is a 5% chance that any non-player unit blows up upon death with explosive area of effect damage, final score will decrease.
Pain Train Level: Beachhead
Special Objective: Kill 10 Flood Bomber Forms
Location: In the starting area, near the Flood buildings (west of the starting area).
Icon: A skull marked with a red ruby.
Effect: All player units train 50% faster, final score will decrease.
Bountiful Harvest Level: Reactor
Special Objective: Destroy 20 Vampires
Location: North-most part of the map near the second Covenant base.
Icon: Normal Skull only different colored balls are on each side of skull.
Effect: Supplies come in 25% faster, final score will decrease.
Emperor Level: Escape
Special Objective: Destroy 3 Scarabs
Location: North east of the map near a hot water spring and a flood base.
Icon: A skull marked with a crown.
Effect: All player powers recharge in half the time, final score will decrease.
Honor Guard Wraith (UK ONLY) Level: None
Special Objective: Buy Halo Wars Limited Collector's Edition.
Location: None
Icon: A picture of an Honor Guard Wraith.
Effect: Turns all Wraith tanks in your command into Honor Guard Wraiths (excluding jacked ones.)
Flame Decal Warthog (US ONLY)Level: None
Special Objective: Preorder Halo Wars either CE or Normal copy.
Location: None
Icon: A picture of an Flame decal Warthog.
Effect: Turns all Warthogs into Sprit of Fire Flame Decal Warthogs.
