[johnarryn]

Actually, the Nexus produces ONLY astral gems for the caster. What it does not do is absorb Astral or Blood spells. So if you're opponents are only using Astral or Blood, you'll get nothing as far as I know. What Pyscho was saying is that if you wish for gems, get a bunch of non-astral gems and spend them on non-Astral spells, that spending will be translated into Astral gems by the Nexus.