Board Thread:Naruto Discussions/@comment-4271790-20141104021906/@comment-945885-20141104210343

Kurama Mode is stated to be the "complete version" of Nine Tails Chakra Mode, accomplished when Naruto and Kurama synch their hearts. It allows Naruto to use the most powerful secret abilities of the jinchuriki, like Biju Bomb and Biju Transformation.

Naraka Path is the secret jutsu to extract and eat human souls and beckon (呼び出す, different from kuchiyose) the King of Hell. The rest just explains what we clearly saw; that when it grasps them they are weakened and can't resist, that if it eats their souls they die, and that it judges them, etc.

Asura Path allows the user to summon weapons and armor into their own body. They become a living weapon with a repulsive appearance, and their flesh and blood (生身, also means "body of a buddha or bodhisattva") constantly changes in amazing ways that allow them to overwhelm their opponent with taijutsu. It summons ballistic weapons unlike anything ever created in the ninja world, and when moving from long range to close range, dynamically swaps out (換装, mechanical term, "exchange parts") its weaponry to meet whatever is needed in battle. (Very impressive!)