Orcs Must Die! Unchained (PS4) - Grand Finale Weekly Challenge Guide (5 Star with Max)
This is the Weekly Challenge of 1-9-18.
I personally found this easiest as Max, as he can place Decoys with no cost. I think it's a Challenge that might be tough at first, but with a little practice it becomes fairly easy.
On the first wave, you should have enough coin to block off all but one side of the Rift. When I normally do Midnight Market, I always force them down into the SE, so I just do that here as well. I place down a Coin Forge in the middle, just for a chance at extra coin, but I ultimately don't use it much. I place down 4 Decoys, which will slow the minions down somewhat.
My general strategy is to use Boom Barrels in conjunction with the Decoys. By placing Barrels near the Decoys, you can group a few of the minions, allowing you to kill multiples with a single explosion.
Not only that, but it allows you to take advantage of how the Decoys gain threat. There is a limit to how many minions will attack the Decoy, and you will notice that once that limit is reached, all the other minions will simply ignore it and continue their path. However, by placing a Barrel down and killing the minions that are actively attacking the Decoy, the other minions (that are ignoring it) will actually go back and attack it, allowing you to slow them down.
Truthfully, I don't think you need Decoys to finish this Challenge, but they do help. I do two different things with the Barrels: I place them next to Decoys, and I try to replace each Barrel once I destroy it (a good example of doing this well is at 4:54). Trying to replace Barrels actively does take a little bit of practice, but it's well worth it, as it can make this Challenge much easier. If you're playing on the PS4, I tried to get into kind of a rhythm with it; press R1 to switch to the Barrel, R2 to place, L1 to switch to Primary, R2 to shoot (R1, R2, L1, R2) and just repeat that. Do keep in mind you may have to get a bit closer to it because the minions may end up blocking your shots.
The Terracotta minions aren't affected much by the Barrels, so try to use In Your Faces for them, but be aware of your mana usage. The Water Dragons are kind of optional, and it may be just better to try to get them to ignore you so they can just enter the Rift. On the last wave, you get Firelings (from the north gate), which will should go to your Decoys if you have some nearby. I try to destroy them right out of the gate though, as I'd prefer just to kill them myself just to make sure they don't cause unnecessary problems.
Also be warned that Boom Barrels can detonate with other Boom Barrels. This is good or bad depending on what you want to do, but I personally don't want that to happen, so I try to keep them spread out as best I can.
For Max's upgrades, I take Endorsements at level 2, Lucky Shot at level 4, Bad at Self Reflection at level 7, and Persistent at level 10.
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