Summon

Summons a player or mob to your location. If successful the summoned target will appear out of thin air in the same room as you.

Group summon
Used to summon group members into your group

Summon Spell
Summon spell can be used to summon mobs as well as players.

Unsummonable
Target may be unsummonable because


 * 1) They are in a waypoint
 * 2) They have nosum turned on
 * 3) You are in a nosum area

Also the summon spell has additional dependences like the level of the target.