Skill Trees

The Chain Lightning Sentry Assassin can be leveled comfortably through the Trap tree, although the final setup does not fully come together until enough Points are invested into its Lightning synergies. Early progression is usually smoother with Fire Blast and Charged Bolt Sentry, then Lightning Sentry takes over for most of Nightmare while Chain Lightning Sentry gradually becomes the main clearing Skill later on.

Once the core setup is available, prioritize Chain Lightning Sentry, Charged Bolt Sentry, Lightning Sentry, and Fire Blast. These four Skills form the offensive package and should all be maxed, while Shock Web only needs one Point as a prerequisite. This gives the Build strong Lightning Damage while still keeping Fire Blast available as a useful secondary option against Lightning-resistant enemies.

Take one Point in Burst of Speed, Fade, Cloak of Shadows, and Mind Blast for utility. Burst of Speed is particularly useful while leveling because it improves trap placement speed and mobility, while Fade becomes more attractive in dangerous Maps or defensive setups.

After the offensive core is completed, the remaining Points are flexible. Softcore players can invest further into Burst of Speed to make gearing around trap-laying breakpoints easier, while defensive versions can favor Fade or Weapon Block when using dual Claws. A few extra Points in Shadow utility can also be justified, but the standard version keeps most of its investment focused on maximizing trap Damage.

Gear

A high-end Magic or Rare/Crafted Trap Claw is one of the strongest Weapons for the Build. Ideally, look for a fast Greater Talons or Runic Talons base with +3 to Traps and up to +3 to Chain Lightning Sentry, potentially reaching +6 Skill Levels from a single Weapon. Increased Attack Speed is also extremely valuable on the main hand because trap placement uses IAS rather than FCR. A well-rolled Plague in a +Chain Lightning Sentry base is an excellent alternative, combining Skill Levels with Cleansing and useful defensive utility. Bartuc's Cut-Throat works very well as a cheaper transitional option.

For the off-hand, another high-Skill Claw provides the highest raw Damage and also gives access to Weapon Block. Players who prefer a safer setup can instead use Gerke's Sanctuary, Spirit Ward, or another strong defensive Shield. The main-hand Claw should generally use a fast base, while the off-hand can prioritize Skill Levels and defensive modifiers more heavily.

Griffon's Eye is one of the strongest offensive Helmets because its +% Lightning Skill Damage applies to your Sentries. Its Enemy Lightning Resistance reduction does not, however, so the item is not quite as universally powerful here as it is for a Lightning Sorceress. Harlequin Crest is an excellent balanced alternative with +Skills, Life, Mana, and Damage Reduction, while a strong Rare or Crafted Assassin Circlet with Skills, sockets, Resistances, and utility can become an excellent endgame option.

For Body Armour, Enigma is the premium Mapping option. The additional Skill Levels, Strength, Faster Run/Walk, Magic Find, and Blink make repositioning between packs considerably smoother. Chains of Honor offers a much more defensive alternative with Skills and heavy Resistances, while Arkaine's Valor works well if you already have mobility solved and want additional survivability.

Laying of Hands or strong Rare/Crafted Gloves with IAS and defensive stats are excellent when additional trap-laying speed is required. Occultist becomes more attractive in setups that need FCR for Blink and additional curse protection, but FCR itself does not make your traps deploy faster.

For the Belt, Arachnid Mesh is the most straightforward offensive choice thanks to its +Skill Level and useful FCR. Thundergod's Vigor is a strong defensive alternative, particularly in Lightning-heavy Maps, and can be especially appealing if the rest of your equipment already provides enough offensive Skill Levels.

Shadow Dancer is an excellent Boots option for dual-Claw versions, providing useful Shadow Skill Levels and Faster Hit Recovery. Waterwalk offers strong Life and defensive utility, while high-end Rare or Crafted Boots with Faster Run/Walk, FHR, and multiple Resistances are often the easiest way to finish the character's defensive requirements.

For the Amulet, a Magic +3 Traps Amulet is a simple but very effective pure Damage option. Mara's Kaleidoscope offers a more balanced combination of Skills and Resistances, while a high-end Rare/Crafted Assassin Amulet with +2 Skills, FCR, Life, and Resistances can be the best option when you need to complete several breakpoints at once.

For Rings, Stone of Jordan and Bul-Kathos' Wedding Band are natural choices for additional Skill Levels. Wisp Projector is useful when extra Lightning protection is desirable, while strong Rare/Crafted Rings can provide FCR, Life, Mana, Attributes, and Resistances if your final setup needs more flexibility.

Charms

For the Chain Lightning Sentry Assassin, Trap Skill Grand Charms are the best offensive choice. An Assassin Hellfire Torch and Annihilus should form the foundation of the inventory, followed by as many +1 to Traps Grand Charms as you can comfortably fit. Additional Skill Levels provide one of the most reliable ways to scale Chain Lightning Sentry and its supporting traps.

Use the remaining slots for Life, Resistances, and Faster Hit Recovery. Small Charms are especially useful for reaching the 48% or 86% FHR breakpoints without sacrificing stronger equipment pieces. Unlike physical attack Builds, Maximum Damage, Attack Rating, and similar offensive Charm modifiers provide almost no value here, so the inventory should stay focused on Trap Skills and survivability.

Mercenary

An Act 3 Lightning Mercenary is one of the most interesting support options for this Build. His Static Field applies a substantial Lightning Resistance reduction and can even break Lightning Immunities, which directly improves the effectiveness of your Sentries. He also provides additional Lightning Damage and works particularly well for pure Lightning-focused Mapping.

A more traditional alternative is an Act 2 Mercenary with Infinity. Conviction provides reliable resistance reduction around the Mercenary and remains an excellent endgame option when you want consistent support against resistant enemies. Infinity is particularly valuable for Lightning builds because Conviction can break many Lightning Immunities.

• Doomslinger, Mang Song's Lesson, or another strong caster Weapon (Weapon)
• Griffon's Eye or a strong defensive caster Helmet (Helmet)
• Ormus' Robes, Que-Hegan's Wisdom, or another +Skill caster Armour (Armour)
• Magefist or defensive caster Gloves (Gloves)
• Arachnid Mesh or a defensive Belt (Belt)
• Rare Boots with Resistances and defensive modifiers (Boots)