Bug / Exploit , Invincible when fighting boss

[peiterbudiman]

I found it by accident, the character becomes invincible when attacking boss.

<img src="/uploads/default/original/3X/0/c

/0c2de6f8faf389a3528c1b27b0196f741e0abc8a.jpg" width=“690” height=“388”>

[Garrnett]

I think this can be done on any of the bosses in an old topic post, there are multiple pictures of this happening and the boss can do nothing about it.