Orcs Must Die! Unchained (PS4) - Rift Instability Weekly Challenge Guide (5 Star with Blackpaw)
I would say Blackpaw is best here for the 5 Star; Pounce allows him to be a little faster than the other heroes, and Wound The Prey really helps in getting the Unstable Rifts down quickly.
That said, this challenge is a little bizarre, because you need to forego your Score in order to get the 5 Star. Ideally, for the 5 Star, you should manage to destroy most of the Unstable Rifts, which means you'll be getting virtually nothing in terms of Score. This also means you won't be earning any Coin, nor will your Hero level up, if you don't let anything open.
First thing to know - Ceiling Ballistas are worthless for destroying Unstable Rifts. In a previous attempt, I put 5 down (the maximum you can initially afford) at the same spot, right where I knew an Unstable Rift would show up. The 5 Ballistas could not destroy it before it opened.
What you will see me do, right at the beginning, is put down some traps in the long hallway that leads to the SW gate. I put down 3 Ballistas (at the small overhang in the middle, right in front of the gate); 1 Viscous Tar below the Ballistas, then another Viscous Tar further down the hallway (to spread them out), then I just put a Floor Spike in between them.
This is done entirely for the last wave - These traps will more or less get zero use otherwise. The reason why is because on the last wave, you're going to have 2 Unstable Rifts open. There will be a Rift that spawns directly in front of the SW gate, which will spawn 2 Mountain Trolls. By placing traps down near it (preemptively), it allows you to buy some time to deal with other things first.
For all the other waves, you simply need to be comfortable with the map and where the Unstable Rifts are. You can either practice it yourself, or reference the video to see where the Unstable Rift spawn in each wave (they are always in the same spots). I'll break it down very simply though:
Wave 1 - 3 initially at the SW gate, followed by 1 near the south Guardian spot.
Wave 2 - Only 2 Rifts, one up north, one down south.
Wave 3 - All 4 will be in the southern part of the Rift room.
Wave 4 - First is in the Temple area, the rest are spawned in a counter-clockwise fashion (directly north of the temple, then the NW corner, then the western wall, then north of the south Guardian).
Wave 5 is the only wave worth describing - 2 Rifts at first, both in the southern area. Ignore the one at the SW gate, assuming you put traps there. Instead, destroy the Rift directly south of the southern Guardian spot. Next, head north and destroy the Rift at the western wall, then the one in the NW corner, and let the NE corner one open (which will only spawn Tubifore).
Once the NW corner Rift is destroyed, immediately head back to the Rift area, and go to the southern part of it. One last Unstable Rift will spawn, and you should destroy it before focusing on the minions. By the time it's destroyed, the Mountain Trolls in the SW will probably just be exiting that long hallway, and if you trapped like I did, they should be nearly dead.
Tubifore will have full HP though, so immediately hunt him down as soon as the Trolls are dead. In retrospect, I probably should have saved my Call To The Beyond for Tubifore, instead of using it on the Trolls, but it still worked out.
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