Look at the parallel parts of the sentence

who dwelt in an upper realm

A. in which the sky was the floor, and who had the power to give and to take
parallel with who dwelt with , remember parallel clauses should start with the same relative pronoun.
Also "to give" parallel with " to take."

B. where the sky was the floor, having the power to give and to take
not parallel with "who dwelt..."
C. whose floor was the sky, and who has the power of giving and of taking
Apart form other things "whose" should refer to person not to place..

D. in which the sky was the floor, with the power of giving and taking
not parallel with "who dwelt..."
E. whose floor was the sky, having the power to give and take
same as "C" and "D"