Bab 51: This weapon is a gift for you

Blackstone Tribe, Inside the Tent.

After reading Arthas's reply, a smirk crept across Orion's face. In this round of negotiation, he felt like he had finally gained the upper hand. However, even with the advantage, Orion knew that acquiring the [Ghostbone Armor] would still require a significant trade.

Orion narrowed his eyes, staring at the two items he had listed: a B-grade crystal core and a firestone. The crystal core was valuable, but not enough to make Arthas part with the Ghostbone Armor. Orion was well aware of that.

This meant that the real prize Arthas was after was the firestone. 

In other words, the firestone was far more valuable than Orion had initially thought—at least, to Arthas.

Orion glanced at the few remaining firestones in his Bagbird's stomach pouch and thought about the mine currently being excavated by the troglodytes. Slowly, his eyes lit up with realization.