Chapter 977: The Situation In Gildian City

Gustav proceeded to place this item on his forehead and in the next instant he turned invisible. 

[Cognitive Concealment Has Been Activated]

His presence also completely disappeared in the next instant completing masking his existence.

[Hover Has Been Activated]

Thwosssshh!

Gustav flew upwards with intense speed, crossing more than two hundred floors in an instant.

Besides the winds that were generated from his flight speed, no other disturbance could be spotted in the vicinity since he was currently invisible. 

Thwwwiih!

Gustav arrived at the west area, outside the 627th floor and paused his ascent.

[God Eyes Has Been Activated]

God Eyes was so so high level at the moment that even the preventive measures put in place to stop anyone from snooping were unable to stop God Eyes.

Gustav's sight phased through the icy-like walls, peering right through multiple walls and hallways within.