Krishnath said:NAs for summoning a sliver, from where? They have no native plane (that anyone knows of anyways...)
Ashardalon: Only problem with summoning slivers, is that they won't go back to where you summoned them from, not to mention that summoning a queen, would be a *very* bad idea...
But then again, do you allow your players to summon Aasimar and Tieflings?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.