Vengeance is not an INTJ trait. It’s stupid and beneath us; playing the getting-even game. INTJ isn’t in competition with everyone else, they just do their own thing their own way. They really don’t pay that much attention to what others are doing, content to let others do their own thing.
However, there is a thing that looks like vengeance but isn’t vengeance with an INTJ. It is requital according to merits or desserts, especially for evil. Others who do the evil—I’ll call them assholes—often see it as vengeance, because they do not believe they did anything wrong to deserve the INTJ requital.
INTJ is firmly grounded in a strong sense of justice—objective justice, which cannot be honestly disputed. That stance of being-in-the-right really pisses the asshole off which, strangely and quite foolishly, makes the asshole escalate against the INTJ.
To INTJ, assholes are stupid for not backing off, and deserve what they get.
When objectively wronged, INTJ will walk away until it becomes evident that walking away will not end what is being done to them. INTJ will tolerate a lot, much more than most people will tolerate. Stupid people mistake that tolerance for weakness. Evil people try to exploit that tolerance. Not a good idea.
Then, INTJ will warn. Smart people heed the warning and back off.
Then. . .
INTJ will act. It will be done without further warnings, and they will act without any threats or announcements.
The acts of requital INTJ performs will be like a weapon of mass destruction was unleashed on the asshole, leaving them as nothing more than a pile of dust.
The requital will be highly creative, and precisely targeted to the most vulnerable aspects of the asshole, until there is nothing left to dick with the INTJ any more. This will be done in a manner that is completely legal, leaving the asshole with no legal remedies against the INTJ. If the asshole tries anything illegal (yes, they are often that stupid), INTJ will have anticipated it and the asshole will be nailed in the act.
Then, INTJ will walk away and leave the asshole alone as long as the asshole leaves them alone.
The take-away from this is, INTJ is really a very tolerant and gentle person, until someone crosses their line in the sand. Then they are as cold-blooded and precise as executioners. By then, their target has lost any right to forbearance or mercy in the INTJ court of justice.