What exactly is the ninetails power that makes him the strongest jinchuriki?

Yes I've watched all of Naruto and Shippuden. But ok, each of the other tailed beasts has some type of elemental attack e.g. one tail is sand, 4 tails is fire, one has acid breath, other is water reflection?, 8 tails has octopus ink and other octopus related abilities. Sorry, don't remember the names. So besides nearly unlimited chakra, what is kuramas specialty?