They are technical stack and some ninja have them (almost seven sword mist)

They can increase for ninja which has them 2 of these: attack defense resistance ninjustsu or let those ninja use mystery skill

ahaa,ok, thanks

They are called Technique points and they are used to cast Mystery. Few Edo Tensei ninjas are using them instead of chakra.

Don't spread misinformation, some still use chakra, Kushimaru and Jinin are 2 examples.

He said few use them instead of Chakra. Not all. So for example, jinpachi doesn't have Chakra cost, but does have a technique cost. But some use both.