Blade Barrier

Casting Speed:

Fast as of update 9.

Notes:
 * Blade Barrier is not a damage-over-time effect, so if you cast it directly on top of a creature standing inside the blades (but not moving), it will suffer the first initial tick, but no further damage unless it moves out of the blade barrier.


 * Blade Barrier only does damage to creatures as they transition from being within zero Blade Barriers to within one, or vice versa. A creature that is already inside one hostile Blade Barrier takes no further damage by entering another one.
 * If a Cleric casts two overlapping Blade Barriers, crossing both of them will trigger only two hits.
 * However, if there was space left between the rings, crossing both of them would trigger four hits.
 * Thus, a caster who puts additional Blade Barriers close to an existing one may accidentally reduce damage enemies suffer.


 * Enemy AI will not avoid persistent spells, so mobs can be forced to repeatedly cross Blade Barrier zones.


 * Although Blade Barrier deals slashing damage, physical damage reduction does not apply to spells.


 * Damage boosts: Internally the damage is considered both slashing and untyped - thus it is affected by force spell power.
 * The slashing damage is only relevant for creatures who have special reaction to slashing damage, such as oozes that split.

PVP:

Spell usable in Players versus Players, but not in brawls.

Limitations:

Like most persistent spells, will not function in water.