"Stay" is a synonym for "Stop" or "Halt" in this case. See defn 4a & 4b here:
4a: to stop or delay the proceeding or advance of by or as if by interposing an obstacle : HALT
4b: to check the course of (something, such as a disease)
"their wicked hand" most likely ...
An example may be First Among Equals Which has been applied to the British Prime Minister. The Wikipedia article under the link has a number of other interesting applications of the same concept including the Archbishop of Canterbury.
It also contains the useful definition
Bearing higher status and various additional powers while remaining still merely ...
Scrambling is a verb meaning to climb over boulders or rough ground. It's like "climbing, but not as vertical", if you know what I mean,
https://www.merriam-webster.com/dictionary/scramble has it as:
1: the act or an instance of scrambling: such as
a: the act of moving or climbing over something quickly especially on all fours,
eg "scramble ...