Summoning Circles
From AmtWiki
A triad of Terrain types from the Celestial Codex--unique in that their descriptions treat them as Fixed Enchantments, though they require Reeve permission to be placed and are not tied to any one caster.
Description from the Celestial Codex
There are three different types of summoning circles: Binding Circles, Banishing Circles, and Conjuring Circles. No two summoning circles can overlap at any point, not even if they are of the same type. Summoning Circles are strictly a battlegame-specific plot element and must be pre-placed by a Reeve or else have the construction part of a larger quest. In any event, players may not simply evoke one without Reeve approval.
