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Early thoughts after two/three days of playing the game. I dsagree on Gheist. It's not the best one, but it's cool. My best run was: Woad, Gheist and Hydrim, if I remember correctly.
Also, Strigeye is veeeeery powerful. A glass cannon incarnated. But I agree on Tuskal. It's broken XD
I also think that Skimander is powerful but requires the right setup (with Chip, for example).
I'm having so much fun with this game. The combinations are endless.
I'm sure after a while I will have a totally different tierlist, but we'll see.
Oh, also, I'm finding myself always playing with 3-4 monsters in the party. It's hard to have less or more than that, because minor stages really suffer toward the end in most fights. I don't know if it's intentional or not in the design, I just wanted to share. It's interesting.
Almost always I end up with 3 perfect monsters against the final boss.