Halo 3 Help

Now, how to find the skulls. Each level in Halo Wars has an optional objective where you are asked to kill a certain number amount 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 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. Example, the HUD will show "56/100 Grunts Killed" or something similar. Here is the information I have managed to find thus far. One last thing to note, is that the skull will not appear in it's location until the objective has been met.

 

Halo Wars Skulls

• Look Daddy!
• Kill 100 grunts
• Mission 1: Alpha Base
• Location: On embankment near the downed ghost where last set of marines are found
• Special effect: When grunts die their methane tank always shoots off

• Grunt Birthday Party
• Kill 20 Jackals
• Mission 2: Relic Approach
• Location: Southwest of your starting base location in front of damaged gate
• Special effect: Grunts explode into confetti

• Cowbell
• Kill 45 Hunters
• Mission 3: Relic Interior
• Location: In front of the main console where Forge and Anders are initially pinned down
• Special effect: Destruction physics magnified

•  Wuv Woo
• Kill 50 Elites
• Mission 4: Arcadia City
• Location: Very eastern part of the map near statue of man holding book
• Special Effect: Scarabs shoot rainbow made of pure love

• Fog
• Kill 5 Wraiths
• Mission 5: Arcadia Outskirts
• Location: north west of map on top the highway near two buildings
• Special effect: No minimap. Final score will increase

• Sickness
• Kill 50 Banshees
• Mission 6: Dome of Light
• Location: In the hanger immediately behind your base
• Special effect: All player units have 50% fewer hitpoints. Final score will increase

• Rebel Sympathizer
• Kill 10 Locusts
• Mission 7: Scarab
• Location: Next to the power node to the west of the scarab 
• Special effect: Non-player units get 25% more hitpoints. Final score will increase

•  Rebel Supporter
• Kill 750 Infection Forms
• Mission 8: Anders' Signal
• Location:On cliff edge beside a crevas in the northern part of the map
• Special effect: Non player units do 50% more damage final score will increase

•  Rebel Leader
• Kill 20 Flood Stalks
• Mission 9: The Flood
• Location:  By the downed pelican to the west of your starting base
• Special effect: Non-player units star with extra veterancy. Final score will increase

• Catch
• Kill 350 Swarms
• Mission 10: Shield World
• Location:On the island in the south east section of the map (you need air units to reach it)
• Special effect: All player units recharge unit abilities in half the time. Final score will be decreased

•  Sugar Cookies
• Kill 100 Sentinels
• Mission 11: Cleansing
• Location:North east section of the ship in between both platforms (you need air units to reach it)
• Special effect: All player units have 50% more hitpoints. Final score will decrease

• Boomstick
• Kill 12 Spirit Transports
• Mission 12: Repairs
• Location:North east section of the ship above the central stucture
• Special effect: 5% chance any non-player unit blows up upon death with explosive area of effect damage. Final score will decrease

• Pain Train
• Kill 10 Bomber Forms
• Mission 13: Beachhead
• Location: In the first area you start in near the flood buildings (west of map)
• Special effect: All player units train 50% faster. Final score will decrease

• Bountiful Harvest
• Kill 20 Vampires
• Mission 14: Reactor
• Location:North-most part of the map near the second covenant base
• Special effect: Supplies come in 25% faster. Final score will decrease

• Emperor
• Kill 3 Scarabs
• Mission 15: Escape
• Location:North East of the map near a hot water spring and a flood base
• Special effect all player powers recharge in half the time. Final score will decrease