Soooo apparently Solro does the necromancy.

[Jimjam]

So Marnek is an IRL reference.

Sol Ro is the Prince of Fire - Princes are high ranking officers of Empire. Fires needs fuel.

Fossil fuels are the long dead remains of living creatures, which can be burnt to release energy.

How does this tie together? Well. Marnek, founder of Sol Ro cult ‘The Burning Dead’ is an anagram of ‘Enmark’.

For those not familiar with Enmark:

Colonial Group Inc.
Enmark is a subsidiary of Colonial Group Inc., a private company with extensive ownership in oil and gas-related companies. Colonial was ranked 59th in Forbes magazine's 2012 listing of the nation's largest private companies.

Marnek’s struggles with the knights of Prexuz is a reference to offshore oil drilling operations and the shipwrecks and oil spills related to them.