Spacetime: Spacetime ninjutsu, also called "jikuukan ninjutsu" is an obscure branch of ninjutsu involving the retrieval, summoning or transportation of an object or creature from one place to another.
By far the most common use of spacetime ninjutsu is the Summoning Technique and others of its variety.
Any detail on other Spacetime ninjutsu techniques for example those with the Teleportation subtype are considered Forbidden knowledge (DC 30 or higher Knowledge (ninja lore) check.) You take a -8 penalty to Learn checks and take twice as long as normal to learn Spacetime techniques.