Main Objective: Collect Ursadon Matriarch Essence, Recover the Lost Brood, Destroy Psi-link Spires [0/3] Bonus Objective: Kill the Ursadon Matriarchs [0/2]
Harvest of Screams: Complete the "Harvest of Screams" mission in the Heart of the Swarm campaign. Ice Breaker: Destroy 20 unfrozen enemy structures in the "Harvest of Screams" mission. Storm Chaser: Complete the "Harvest of Screams" mission in less than 15 minutes on Normal difficulty.
The first few packs can be dealt with by a-moving and using your cooldowns until you reach the first in-game cutscene. After your units thaw out, focus the Ursadon Matriarch down and collect her essence.
Don't forget that you can burrow your roaches to heal them.
Once you recover the lost brood start working on your economy. Kite the group of units by the first Psi-link Spire back to your spine crawler. Use Kerrigans Kinetic Blast to one-shot Archons.
The Protoss will attack with a large group of zealots. Luckily, the first flash freeze will occur. Clean up this wave and do as much damage as you can to the remaining units guarding the psi-link spire.
There will be one more wave of units before the next flash freeze. After you finish it off, build some units so they spawn in time to attack when the next flash freeze occurs.
Take the expansion after you clear out the psi-link spire. Watch your main, because there will be another group of protoss units attacking shortly.
Don't let your guard down during flash freezes. Ursadons are immune to them and will attack you, so be sure to keep an eye on the minimap.
A group of Protoss units will attack you next from the northwest. There are minerals and gas by the entrance of the pathway to the first Ursadon Matriach, which will help you replenish your forces.
With enough roaches, the Ursadon Matriarch packs become pretty trivial. As long as you're keeping up with your economy, you should be ok pumping out more roaches and lings pretty frequently.
Even the protoss groups are dispatched fairly easy with huge groups of roaches, remain modest. There's no reason to throw away units, when you can easily go back and wipe out the protoss bases during flash freezes without a scratch.
Take out as much of the next protoss base as you can during the next flash freeze. You'll be attacked by Ursadons there and they will attack your base as well, so be ready to defend.
With enough roaches, you can afford to attack the protoss even though the flash freeze hasn't happened yet.
By the time the next flash freeze is over, you should have enough time to take out the majority of the protoss base guarding the second psi-link spire and the last Ursadon Matriarch.
At this point in the mission, you should have amassed enough roaches where you can easily a-move to victory.
Use the final flash freeze to ensure victory and overrun the last protoss base.
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