Diablo II: Lord of Destruction/Traps

The assassin who masters traps may focus more of her stat points into energy, because the quantities of monsters she must face hand to hand will be reduced by her devastating traps.

Traps may be set on the far sides of closed doors (select a trap, and click when the cursor is hovering over the door so that "Closed Door" appears). Use this sneaky trick especially when you see the colored glows of special monsters within the next room you'd like to explore.

An assassin may create up to five traps (regardless of type or mix) at one time; if she summons more than five, the oldest among the existing traps will detonate harmlessly. Traps will stay indefinitely, so long as they do not use up their charges and so long as the assassin stays near them to keep them active. If an assassin sets a trap and then moves so that it is offscreen, the trap will soon fade.

Fire Blast
This low-level spell will likely be a simple stepping-stone to more advanced spells. It does not need to be targeted on an enemy; clicking on any open ground will do.
 * Description: Tosses a small globe of fire that explodes on contact
 * Level prerequisite: 1
 * Skill prerequisite: None
 * Mouse button: Left or right

Shock Web
This spell does more damage for less mana than the more advanced traps, although it immediately activates, even if no enemies are nearby. Several shock webs can be cast into the same area, multiplying the effect of this nasty spell. This spell may be targeted on the ground as well as on enemies.
 * Description: Creates a web that does area-effect lightning damage
 * Level prerequisite: 6
 * Skill prerequisite: Fire Blast
 * Mouse button: Left or right

Blade Sentinel
This spell need not be targeted on an enemy, but it must be aimed in the direction you wish the blade to fly. For the duration of the spell, the blade will move between your original firing position and the target point. If you want the blade to make more trips back and forth during its short life, click an enemy or the ground near you. You may have at most two blade sentinels in the air at one time.
 * Description: Shoots a blade in the direction of the attack that flies to and from the endpoints until a time limit expires
 * Level prerequisite: 6
 * Skill prerequisite: None
 * Mouse button: Left or right

Charged Bolt Sentry
This trap releases small charges of lightning that spread toward the intended target, hitting anything in their path. Due to the ever-widening spread of the charges, lucky enemies may escape its effect. This trap is especially useful in crowds, where the charges are unlikely to miss, and in open field, where the charges will not expend themselves against walls.
 * Description: A trap that releases lightning damage when an enemy approaches it
 * Level prerequisite: 12
 * Skill prerequisite: Shock Web
 * Mouse button: Right

Wake of Fire
Once it chooses its target, this trap emits a V-shaped set of flames that point toward that target. All other monsters caught in the flames will suffer damage, however, making this a very useful trap in open areas.
 * Description: A trap that inflicts several waves of fire damage upon nearby enemies
 * Level prerequisite: 12
 * Skill prerequisite: Fire Blast
 * Mouse button: Right

Blade Fury
These blades do not boomerang like a blade sentinel, but travel in a straight line toward the enemy or piece of ground that is targeted. You may have at most two sets of blade fury active at one time. When a blade has done its maximum damage, it shatters, although its companions, if any, will continue on their way.
 * Description: Shoots three blades in the direction of the attack
 * Level prerequisite: 18
 * Skill prerequisite: Blade Sentinel, Wake of Fire
 * Mouse button: Left or right

Lightning Sentry
This trap blasts a stream of lightning at nearby foes, causing damage to any monsters caught in the stream. Because this trap fires in a straight line, it is especially useful in narrow hallways and walkways, where monsters are likely to be approaching single file. Be aware that a lightning sentry may choose to fire at an enemy that is just out of its range, wasting the mana it cost you to cast the trap.
 * Description: A trap that attacks nearby enemies with a blast of lightning
 * Level prerequisite: 24
 * Skill prerequisite: Charged Bolt Sentry
 * Mouse button: Right

Wake of Inferno
This trap ejects a billow of flame at nearby foes, causing damage to any monsters caught in the way. Like the lightning sentry, this trap fires in a straight line, so it is especially useful in narrow hallways and walkways, where monsters are likely to be approaching single file. This trap may choose to fire at an enemy that is just out of its range, wasting the mana it cost you to cast the trap.
 * Description: A trap that incinerates nearby enemies with a stream of fire
 * Level prerequisite: 24
 * Skill prerequisite: Wake of Fire
 * Mouse button: Right

Death Sentry
This devastating trap creates a wonderful chain effect, sizzling an enemy with its lightning discharge and then detonating the corpse the moment approaching enemies come near it. Without a doubt, this is the best trap to use in a crowd full of tough monsters.
 * Description: A trap that detonates any corpses by nearby enemies or fries the enemies with a blast of lightning
 * Level prerequisite: 30
 * Skill prerequisite: Lightning Sentry
 * Mouse button: Right

Blade Shield
This seemingly defensive skill actually causes great harm to nearby enemies, making it possible to rage through a crowd of monsters without even lifting a claw. Its duration is not affected by any other skills.
 * Description: Defends the assassin with a cocoon of whirling blades
 * Level prerequisite: 30
 * Skill prerequisite: Blade Fury
 * Mouse button: Right