This has been bugging me for a while. It was a series of books, read the first one and I would like to continue it but can't for the life of me remember the book title or author. I remember they where traveling on an alien world. Come to a grassy plain but the grass was so tall and sharp that it would shred you if you tried to walk through it. They ended up traveling across the plain on what was described as a boat of sorts. They where being pursued by a female that had metal skin with spikes coming out of her limbs, metal teeth and pretty much unstoppable. I know it's not a lot to go off of but any help would be appreciated. Thanks all.