Serina/Gameplay

From Halopedia, the Halo wiki

Halo Wars 2

"Smart AI that ran the Spirit of Fire's systems before being lost with all hands. Serina was an expert in cryo technology."
— In-game description of Serina.[1]
  • Unique Units: Bison, (Hero unit) Cryo Troopers, (Replaces Hellbringers) and ZAV-48 Frostraven
  • Privileges: Allows Serina to deploy and augment unit with cryo capabilities.
  • Tier 1 Leader Powers
    • Ice Barrier I: Manually drop three chilling ice blocks. Freezes nearby units when destroyed.
      • Population Cost: N/A
      • Supply Cost: 100
      • Power Cost: 40
      • Cooldown: 90 seconds
    • Ice Barrier II: Adds two more ice blocks to be dropped and increases block health and duration.
      • Population Cost: N/A
      • Supply Cost: 140
      • Power Cost: 60
      • Cooldown: 90 seconds
    • Cryogenic Generator I: Drops a line of cloaked mines onto the battlefield. Once armed, mines explode on contact. Explosion chills or freezes enemies. Does not damage air units
      • Population Cost: N/A
      • Supply Cost: 75
      • Power Cost: 75
      • Cooldown: 105 seconds
    • Cryogenic Generator II: Increases damage and explosion size.
      • Population Cost: N/A
      • Supply Cost: 150
      • Power Cost: 150
      • Cooldown: 105 seconds
  • Tier 2 Leader Powers
    • Cryotech Advances: Adds energy shielding and chill aura to Cryo Troopers. Adds a chill effect to M400 Kodiak and Siege turret shells. Adds a chill aura to the player's turrets and power nodes.
    • Frostraven: Unlocks the Frostraven for purchase at Firebase.
  • Tier 3 Leader Powers
    • Seismic Blast I: Drops a seismic charge that shatters frozen targets for large damage.
      • Population Cost: N/A
      • Supply Cost: 300
      • Power Cost: 200
      • Cooldown: 150 seconds
    • Seismic Blast II: Increases the size of the blast.
      • Population Cost: N/A
      • Supply Cost: 300
      • Power Cost: 300
      • Cooldown: 150 seconds
    • Restoration Drones I: Units and buildings within area are healed.
      • Population Cost: N/A
      • Supply Cost: 200
      • Power Cost: 50
      • Cooldown: 160 seconds
    • Restoration Drones II: Increases power of Restoration drones
      • Population Cost: N/A
      • Supply Cost: 350
      • Power Cost: 125
      • Cooldown: 160 seconds
    • Restoration Drones III: Increases power of Restoration drones
      • Population Cost: N/A
      • Supply Cost: 400
      • Power Cost: 150
      • Cooldown: 160 seconds
  • Tier 4 Leader Powers
    • Cryo Bomb I: Activate to freeze units and buildings in the area, stopping all movement and actions.
      • Population Cost: N/A
      • Supply Cost: 200
      • Power Cost: 200
      • Cooldown: 228 Seconds
    • Cryo Bomb II: Increases area that gets frozen
      • Population Cost: N/A
      • Supply Cost: 300
      • Power Cost: 300
      • Cooldown: 228 Seconds
    • Cryo Bomb III: Further increases area that gets frozen
      • Population Cost: N/A
      • Supply Cost: 400
      • Power Cost: 400
      • Cooldown: 228 Seconds
    • Turret Drop I: Drops a temporary turret into battle.
      • Population Cost: N/A
      • Supply Cost: 400
      • Power Cost: 25
      • Cooldown: 203 Seconds
    • Turret Drop II: Increases Turret damage and duration of Turret Drop
      • Population Cost: N/A
      • Supply Cost: 550
      • Power Cost: 50
      • Cooldown: 203 seconds
  • Tier 5 Leader Powers
    • Cryo Drop: Activate to drop in 3 Seismic Blasts, 2 veteran Cryo Troopers, 2 veteran M808S Scorpions, and 1 veteran Frostraven.
      • Population Cost: 24
      • Supply Cost: 1,300
      • Power Cost: 500
      • Cooldown: 360 seconds
    • Glacial Storm: Drops a huge cryogenic charge. Creates a long-lasting ice storm upon impact, which chills over time.
      • Population Cost: N/A
      • Supply Cost: 450
      • Power Cost: 459
      • Cooldown: 360 seconds (One Retriever Sentinel per player only)

Serina is unique for her ability to freeze enemy units and structures. When a unit is chilled it will slow down. When it is fully frozen it will become immobile and if the frozen unit takes enough damage will shatter causing massive damage.

Sources