En: is an advanced application of Ten and Ren. In Ren, aura usually envelops only a small amount of space around the user's body. En is when one extends their Ren so that their aura extends further than normal, then uses Ten at the same time to contain and give shape to that aura, normally a sphere. The minimum requirement is to extend one's aura to a radius of more than 2 meters (6.56168 feet) and hold it longer than 1 minute. Someone using En can feel the shape and movement of anything within the area covered by their aura, with the degree of awareness and finesse depending on their level of skill. Nen users can be told apart from regular people due to their stronger reaction to the En user's aura.
Those who master En are typically able to extend it to a circle with a 50 meter (54 yard, 2 foot, 0.5052 inch) radius. There are exceptions, however: Zeno Zoldyck, one of the most powerful assassins alive, is able to extend his En up to a radius of 300 meters (328.084 yards), while the Chimera Ant Neferpitou has an irregularly shaped En and can extend a tendril up to 2 kilometers (1 mile, 427 yards, and 8.0064 inches). The downside to this technique is that it is extremely tiring and draining for the Nen user to constantly deploy so much aura.
in: is an advanced form of Zetsu used to render one's aura imperceptible, effectively concealing it. Unlike Zetsu, however, In does not stop the user's aura flow; instead, it hides it, making it impossible to perceive with any of the five senses or extrasensorial perception. Hence, this technique is perfect for launching sneak attacks or laying traps, as it can conceal not only the user's presence, but also Nen constructs generated with Transmutation, or Conjuration.
In can be countered by using Gyo in the eyes or through Zetsu. When Inconceals part (or even all) of the user's aura output, experienced Nen users can divine their opponent is using it if little or no aura can be felt from them in circumstances which would normally require it, such as during combat.
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