[TD Balance] Artillery: Turn Speed

[anjew]

Artillery Turn Speed increased to 4 from 2.

Artillery is one of the most underused units in TD. Although on some maps I have known a few players to use this with good results. Would like to test this out but I dont see it being too much of a problem

[AoAGeneral1]

Testing would be nice indeed. Though fairly comfortable with this change. Also keeping my eye on the reason someone brought back explosion chance again. Nothing to bad though.