Feat[]
"They had escaped halfway across a mountain range before the battle erupted. Ryze suddenly felt the earth fall away beneath him. The ground seemed to retch and squeal, while the sky above them recoiled as if mortally wounded. Tyrus grabbed Ryze and screamed unheard commands, but the words were swallowed by the unnatural silence around them. For the first time, they were witnessing the effects of two World Runes at war.
Seconds later, reality settled. Ryze and Tyrus clambered to the ruins of a nearby peak and looked back upon the valley where the two armies previously stood. Below, they saw insanity - destruction so massive that it defied all physical sense. The armies, the people, the very land itself were gone. An ocean that was previously beyond a day's journey was now rushing to meet them. Ryze could only fall to his knees and stare into the great hole left in the world. The devastation was complete. Nothing remained. Not even the village he once called home."
Calc[]
Firstly i will calc the distance of a beyond a day's journey.
According to this most people walk at a pace of 5km/h.
Considering its a journey longer than one day i will assume an 8 hour walk for the first day and lets say 2 extra hours for the beyond part
10 x 5 = 50km for the diameter or 25km for the radius
Now we run into problems as we dont really get an explanation on what the shape of the destroyed land was so i will assume it to be a half sphere
Volume = 4/3 x 3.14 x 2500000^3 = 6.541666666667E19 cm3
6.541666666667E19 / 2 = 3.270833333333E19 cm3 for the actual volume
It was explained as total devastation where nothing remained so i will assume a pulverization low end and a vaporization high end.
3.270833333333E19 x 214.35 = 7.011031249999E21 Small Country level (1.67 teratons of tnt)
3.270833333333E19 x 25700 = 8.406041666666E23 Large Country level (200.90 teratons of tnt)
Since this was done by 2 world runes the actual result would be only half of the previous value, making the results
Low end = 3.505515625E21 Large Island level+ (837.83 gigatons of tnt)
High end = 4.203020833333E23 Large Country level (100.45 teratons of tnt)