The true nature and origin of Eucharist is a closely guarded secret in the Empire of Golgoth. In fact, only he (and a few lieutenants whose curiosity exceeded their loyalty) know how the drug is made.
Eucharist is a highly addictive stimulant (possibly even at mutagenic levels) and euphoric, described by its users as better than sex (although not, apparently, better than sex and Eucharist combined), although its effects wear off in time. Golgoth gives it only to his most trusted inner circle as a means of both empowering them and ensuring their loyalty – and even then, only once a month. It is generally in the form of standard sized capsules, red and white in colour. It is unclear if anyone has ever survived withdrawal from it, but it is widely agreed that going cold turky from it is a terrible physical and emotional ordeal.
The true secret of Eucharist is perhaps the only thing about it that is more horrific than withdrawing from it would be: it is in fact the unprocessed blood of an alien superhero named Endymion, who came to Earth with powers and abilities far beyond those of mortal men… and who was defeated, imprisoned and used as a source of Eucharist by Golgoth.