After the battle at Ferry Town, Rowan worked with the military to conduct extensive reviews of the fighting.
Actual combat had proved that the Mage Hunter series of high-energy bombs had limited power against the Burning Legion's higher-ranking demons.
Their effectiveness was further diminished in large-scale army engagements. The resources consumed in manufacturing Mage Hunters were disproportionate to the damage they inflicted.
Granted, the Mage Hunter series could deal tremendous damage in small-scale combat. But now The Maw had entered the fray, and the Burning Legion was still pouring troops into Azeroth through its anchor point in the Broken Isles.
The coming battles would certainly not be small, localized clashes, but engagements between massive armies.
For that reason, Rowan decided to accelerate the development of arcane energy element fission technology.
After Arthas, that troublemaker, returned, Gul'dan's main forces naturally withdrew from the Eastern Kingdoms theater.
Not only that, Gul'dan deliberately left some cannon fodder in Southshore so Arthas could legitimately reclaim it and rebuild his prestige.
Gul'dan had his eye on Arthas's ambition. As Kil'jaeden's foremost disciple, he was even more eager to see the Alliance split from within while he conducted his military campaigns.
Arthas might not have had the means to contend with Rowan before, but things were different now.
Arthas had obtained a portion of The Maw's formidable power, and he also controlled a vast army assembled from Azeroth's departed soldiers.
This army had been tempered in the river of The Maw and blessed with the Primus's power.
Kul Tiras's Army Corps would struggle to match it.
Gul'dan was using the Nathrezim demons to lay his plans in the Eastern Kingdoms. Even knowing this was a trap designed to divide the Alliance, Arthas would surely play along.
One was Sargeras's loyal hound, the other the Jailer's lackey.