Each normal node is occupied by different kind of creatures. The higher the Level of the Node, the stronger the Opponents get. You need to fight and win against 3 Waves of Opponents to collect your loot.
Opponents in the Hollerith Node
There are a lot of different kind of creatures wandering around in the MCH World and they change as the Node Version changes.
Keep an eye open for white frappuccino and yellow macchiato Opponents. They are stronger, but reward you with more CE and more rare Extensions.