Li Yao, of course, knew that the undead alchemists were transporting valuable data and certain core items, which were clearly extremely precious.
But Li Yao was equally aware of the combat strength of the fifty thousand Death Knights. Even if he deployed his main forces and successfully stopped them, the sacrifices would be too high for him to accept.
Moreover, these things weren't immediately useful to Li Yao. Even if they were genuinely valuable, at most, they'd end up being transported to Daisom anyway.
Li Yao's goal this time was to take Daisom. Conquering that location would still give him possession of the items—it was only a matter of getting them sooner or later.
Additionally, the parasites acted slowly and could only corrupt targets one by one when opportunities arose. Even if they successfully parasitized, Li Yao would ensure that the Death Knights stayed with the main force.
