From Tekkenpedia

Omen
Command	2,2,3 ~2~2~3 (Force cancel)
Stance
Damage	0
Hit Range	None
Properties
Move Frames		Hit Advantage
Block Advantage		CH Advantage
Chains from		Chains to
b+1+2		f,f+1+2 1+2 f,N,d,d/f+1 f,N,d,d/f+2 f,N,d,d/f+4 1,2,2,3,2,4,3

Omen, also called Devil Jin Possession, is a move exclusive to Jin Kazama in Tekken Tag Tournament that can only be performed if he is partnered with Heihachi Mishima. The command must be input during the Force animation, not after. If the command inputted is 2,2,3 , the entire Force animation will show, however, if ~2~2~3 is inputted, the latter part of Force is cancelled (hence "Force cancel").

During Omen, Jin will adopt Heihachis fighting stance. He will also get Devil's/Devil Jin's third eye (on the forehead), which is what led to the alternate name "Devil Jin Possession". Most action performed during Omen will make Jin "snap out" of it. The only movements that may be used, and still be in Omen "mode", are dash forward, dash backwards, walking forward, and taking small steps backwards (continuously walking backwards will cause him to go out of Omen mode). If only these moves are used, Jin can remain in Omen mode indefinitely.

Things that make Jin go out of Omen mode are crouching, jumping, finishing a crouch dash, continuously walking backwards, blocking, sidestepping, tagging out, getting hit, and attacking. In last case, if the attack is an "Omen attack" (see "Chains to" in the box), Jin exits Omen after the attack, if it is not, he exits it before the attack.