I'm looking at possible ideas for what kind of low- and mid-level spells (and enchantments) could fall under a Magical [strike]Affinity[/strike] Focus w/Portals. Anobody would have ideas to share?
Context: I'm building an NPC magus with Mercurian Magic, and wanted him to have a focus that would help him cast Hermes' Portal and research improvements into it. Since I did not want to go with the basic affinity with "teleport" or "transportation", I figured that "Portals" might make a nice [strike]affinity[/strike] focus. So now I am looking at fleshing out this magus (who will be fairly important for the saga), and I was wondering what kind of spells he might have invented earlier in his career that would fit his [strike]affinity[/strike] focus.