There are two main limitations on this spell, one with each half. Demonic Circle: Summon, which has a base cast time of .5 seconds, gives the warlock a 6 minute buff which is required to use Demonic Circle: Teleport. This buff is normally removed by timing out, by entering an instance, or through death. Demonic Circle: Teleport, which is an instant cast, is limited by a 40 yd range and a 30 second CD. These limitations mean that a warlock can not make this spell into a makeshift hearth, although effective application can be very useful.
One very significant use for this spell is in boss fights where the boss casts a nova spell. Demonic Circle can effectively be used to move out of range or LoS of the nova up to the last second, taking into account GCD, and allowing warlocks to continue DPS'ing at a point when all other party members are running away.
- Patch 3.2.0 (04-Aug-2009): The visual for this spell should now despawn when the warlock dies or when the warlock otherwise loses the aura that allows transport to the circle.
- Patch 3.0.8 (2009-01-20): The teleport now clears all snare effects. This does not include many freeze effects in boss fights.