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In Arknights, summons are units that are deployed by certain Operators and some enemies to help them offensively or defensively.

Friendly

Unless noted otherwise, all summons will disappear if the Operator that deploys them is knocked out or retreated.

Summon Operator Use
Deals Pure damage to nearby enemies and stuns them when deployed. Cannot be summoned at will, instead automatically summoned when Skill-RadiantKnight3.png Blazing Sun's Obeisance is activated. Not counted towards the Unit Limit but will self-destruct when Blazing Sun's Obeisance expires.
Reveals invisible enemies in the surrounding tiles.
Reduces the ATK and DEF of surrounding enemies. Invulnerable and not counted towards the Unit Limit, but will self-destruct after a period of time.
Attacks deal Arts damage. Cannot be summoned at will, instead summoned through Skill-Dusk3.png Image Over Form and Finishing Touch. Not counted towards the Unit Limit but will self-destruct after a period of time.
Ling's Summons Varies depending on the skill used; see article for details. Up to three may be deployed at a time.
Heals surrounding friendly units. Invulnerable and not counted towards the Unit Limit, but will self-destruct after a period of time.
Taunts enemies, has high HP and RES, and can often dodge Physical attacks. Not counted towards the Unit Limit but loses HP over time.
Can only be directly healed by Kal'tsit herself and will have 0 DEF if deployed outside her range.
A weaker illusory double of Phantom which retains his skill and has an independent redeployment cooldown than Phantom himself.
Reduces the ASPD of blocked enemies.
Stuns nearby enemies when deployed. Cannot be summoned at will, instead automatically summoned when Skill-Beeswax2.png Guardian Obelisk is activated. Not counted towards the Unit Limit but will self-destruct when Guardian Obelisk expires.
Extends the Corrupting Heart's range. Invulnerable and not counted towards the Unit Limit, but will self-destruct after a period of time.
Soaring Dragon Varies depending on the skill used; see article for details. Up to three may be deployed at a time.
Tactical Equipment Reduces the DEF of blocked enemies and stuns nearby enemies when deployed. Cannot be summoned at will, instead automatically summoned when Skill-Rosmontis3.png "As You Wish" is activated. Not counted towards the Unit Limit but will self-destruct when "As You Wish" expires.
Nothing special
Push enemies back in each attack. Invulnerable and not counted towards the Unit Limit, but will self-destruct after a period of time.

Trap

Traps are deployed automatically by certain Operators and manually deployed by Trapmaster Specialists, in which case they must deployed on tiles without enemies. When a ground enemy (and only ground enemies) is too close to a trap, it will be triggered; note that invisible enemies will not trigger traps.

Trapmasters can notably replenish their trap's count with their skills.

All traps are invulnerable and do not use up the Unit Limit.

Trap Operator Use
Deals Physical damage when triggered and either binds or pushes back the victim(s) depending on the skill Robin uses. Up to 6/8/10 may be deployed at a time.
Front Toward Enemy Deals Physical damage and stuns enemies in the surrounding tiles when triggered. Cannot be deployed at will, instead automatically deployed through Skill-W2.png Jack in the Box. Will disappear if not triggered after some time.
Deals Physical damage when triggered and either stuns or binds the victim depending on the skill Frost uses. Up to 6/8/10 may be deployed at a time.

Reinforcement

Reinforcements are utilized by Tactician Vanguards and can only be deployed on a tile within their attack range, which is designated as a "Tactical Point". When the Tactician attack enemies being blocked by their Reinforcement, the damage they deal is increased.

Should a Reinforcement is KO'd or retreated, it will revive itself over a period of time during which it is invulnerable but can neither attack nor block enemies.

All Reinforcements cost no DP to deploy and do not use up the Unit Limit.

Reinforcement Tactician Features
Nothing special
Can attack sleeping enemies, which it will target over the others.

Support Device

Support Devices are utilized by Artificer Supporters to augment friendly units. An Artificer can only have a limited number of Support Devices deployed at a time.

All Support Devices do not use up the Unit Limit, are invulnerable, and will self-destruct after some time have passed from when they are deployed.

Support Device Artificer Use
Buffs the DEF of a melee unit and grant them Shield(s). Up to three may be deployed at a time.

Enemy

Summon Enemy Use
Kite Periodically fires a high-explosive shell straight ahead until destroyed, dealing AoE damage centered on the first friendly unit hit by the shell.
Offspring Entangles an allied unit to damage and stun them as well as inflicting Nervous Impairment build-up until destroyed.
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