The General's Tomb was the death bed of the City of Light's famous general [Var? Wind Earl]. He was the bravest warrior in the City of Light and was very powerful. He had raged and led hundreds of thousands of warriors into the Dark Lair because the Dark Shrine had abducted his wife. He had fought to death there.
However, everything had been planned by the Dark Shrine as the war ground had become a great soul summoning spot for them. Countless ancient generals had awoken from their slumber and transformed into the Undead Soldiers that were manipulated by the Dark Shrine. Furthermore, the revival ceremony for the Wind Earl was in progress as well.
Lin Jie was extremely well-versed with the background story, but he did not regard the Wind Earl's gritting and tragic life of importance. Instead, he was concerned with the items in the tomb—ancient equipment, armories, treasure chests, gems, skill books, and so on. Those items were the valuable portion of the 'tomb'.