Trap

For Templar Assassin's sub-ability, see

Trap is a type of disable that completely or partially surrounds a unit with immobile objects or restricts their movement in such a way that they cannot escape. Traps do not prevent any actions, such as attacking or using abilities and items, from being performed. Spell interactions might be different for each traps with any escape skills.

Definition[edit]

Trap Types	Aspect / Definition	Examples
Pathing Blocker	An invisible entity with a collision size that physically block other units walking against them, unless the caster has unobstructed movement.	Fissure
Temporary Fence	A force field that utilizes leash to prevent a unit from moving out of or into the affected area, by drastically slowing their movement speed towards 0 when close to the edges of the field. This movement speed slow is not shown in the HUD.	Kinetic Field

Pathing Blockers[edit]

Main Article: Collision Size

Defender's Gate Visualized.

A pathing blocker is an invisible entity with a collision size that physically blocks other units. Walking against a pathing blocker is akin to walking against any other unit that is not phased or flying, or walking against trees.

Phased movement does not allow a unit to path through pathing blockers, but flying or unobstructed movement does. Lane creeps cannot walk around pathing blockers and try to walk through them, effectively getting fully stopped by them. Player-controlled units try to path around them if possible.

These pathing blockers (npc_dota_thinker) created are generally not selectable.

The smallest distance between a pathing blocker and another unit depends on both entities' bound radius, not collision size. For example, the smallest distance between Marci and a Cycloned unit's center will be the sum of both entities' bound radius, which will be 2.5.

The picture on the right shows the Defender's Gate utilizing the collision size mechanic as a pathing blocker visualized.

Pathing Blocker Sources

¹ Requires

talent.

^2a Requires

Aghanim's Scepter.

^2b Requires

Aghanim's Shard.

Temporary Fence[edit]

A temporary fence is a force field that prevents a unit from moving out of or into the affected area, by drastically slowing their movement speed towards 0 when close to the edges of the field. This slow only affects the unit when trying to cross the barrier, if the unit turns around and walks away from the edge, they are not slowed anymore.

Barriers Creating Abilities

Disruptor - Kinetic Field

Creates an indestructible circular barrier of 70-unit radius that enemies cannot walk in or out of. The field does not affect units under the effect of spell immunity.
Grimstroke - Soulbind

Prevents the target and its linked ally from moving more than a certain range away from each other.
Mars - Arena of Blood

Creates an indestructible circular arena of 100-unit radius that enemies cannot walk in or out of. Does not affect units under the effect of spell immunity.
Slark - Pounce

Restricts the leashed target's movement to a 2.5/2.75/3/3.25-unit radius around Slark's landing position. Does not affect units under the effect of spell immunity.

Forced Movement Disabling[edit]

Barriers also work against several sources of forced movement, stopping their movement instantly once the unit gets pushed towards the edge of the field. However, the forced movement aspect of the ability is not canceled — if the barrier disappears, the forced movement may continue towards that direction.

Forced Movement Sources Disabled

¹

Rebound initial dash gets stopped by barriers, but the leap can pass through.

Version History[edit]

Version

Description

6.81
(2014-04-29)

Creeps no longer try to path around Fissure; they will wait for it to disappear.

Patch History[edit]

Patch

Description

16 Jun 2022

UPDATE 2
- Fixed ability interactions between the following Pathing Blockers with DOTA_OBSTRUCTION_PROPERTY_NPC_STOPPER flag, Roll Up and Rolling Thunder: