Sundial sets all creature's attacks to 0. It does not stop them from attacking.
I thought I had found an awesome way to stop Adrenastave healing....
Sundials sets all creature's attack to 0, mechanically yes.
But be careful, Adren do not think the creature's attack is zero.
For example, 15ATK adren creature gain only one additional turn under Sundial, not four.
And, staff's "regenerate" skill is activated every TURN, not every ATTACK. It heals you even it's stopped(frozen, delayed).