When a creature gets burrowed, its attack is cut in half, rounded down. Meaning, if you cast unstoppable on an elite shrieker and burrow it, it should have 5atk. However, today when I fought obliterator, when he cast unstoppable on his elite shrieker then burrowed it, it had an atk of 6. I am very sure that he did not cast multiple unstoppables. Only one per shrieker. All his burrowed shriekers had 6 atk. When I later opened up trainer to test, I burrowed my own unstoppable'd elite shrieker it had 5atk. Why is this? Sorry I don't have any screenshots.