Dead King's Scepter does not activate when using Dehydrate at any level of supercharge. Is this intentional? Dehydrate is a supercharge.
What Isif said, also is Dehydrate a true SC? I thought Water's supers were Whirlpool, CotD, Flood of Power and Tranquil Pool.
If I recall correctly, it is not a supercharge...it just uses the supercharge you have built up. So, while acting like a supercharge, it's not a true supercharge because it doesn't have the SC label. I also believe isif is correct, EoG is the artifact that procs upon the use of a super...dead kings scepter only increases strength of orbital and reduces cool down on orbital, supply drop and buff trinkets.