Ancient Mixed Golems defense buff?

It's not a defense buff but an attack buff (they hit harder, or should).

They have both a shield and sword buff that cast separately so I am not 100% sure it's the shield - just seems that way. The attacking one seems to move them from 7 to 13k hits on me.
1.5x seems right, it's just... weird. Maybe it's meant to be 0.5x or something.