To unlock Lei Luo’s exclusive frame and accompanying achievement “Thundurous Growl”, the player has to complete the following challenge:

In SOLO mode, clear all 4 acts using ONLY SNIPERS/FOUNDRY in NIGHTMARE DIFFICULTY or above. (Playing as LEI LUO)

This means that dealing damage with any other weapon type will fail the attempt! Equipping them is allowed, but be very careful! To avoid accidents from happening, I recommend only picking up snipers.

Luckily this challenge isn’t all that different from most True-Sniper Lei Luo playthroughs.
The biggest difference being a potentially more difficult first/second stage and the fact that you have to play all alone, solo…

The following weapons fall under the SNIPER class:
Bloody Drill, Double Caliber, Golden Bow, Goshawk, Piercing Flame, Sting, Strike Wing, Woodpecker

During the first Act, pick up whatever sniper you can find. Later on, once you get the opportunity, equip a BLOODY DRILL

• Bullet penetration
  Playing solo means that YOU are the primary target of ALL enemies at ALL times. You can avoid getting singled out by shooting enemies who are lined up, as they often tend to do when swarming. Bullets also penetrate the shields of Horseheads and Henchmen, making them very easy to deal with.
  
  
• Stackable bleeding effect
  10% of damage dealt will be applied as Bleeding, which deals true-damage every second for 5s, bypassing shields and armor. This effect can be stacked INDEFINITELY and will cause the enemies health bar to literally MELT after only a couple of shots! This is amazing against Elites and Bosses. Another advantage is that you can let low priority enemies bleed to death while you reposition yourself and move onto another target.
  
  
• Large hitbox, fast bullet speed
  Very easy to hit dem weak spots!

The most effective inscriptions are those that increase:
Rate of Fire, Magazine Capacity, Reload speed, Bleeding damage and Lucky Shot

Link together with Strike Wing using a CritX Gemeni. (Default 7.0x!)

Can't find a decent Bloody Drill? - Alternative:
(Strike Wing) - Powerful but requires significantly more skill to use effectively. Hitting weak spots is harder because arrows have smaller hitboxes and travel slower. The scatter effect upon hit makes it great for clearing stages and the default 5.0x Crit modifier is the highest in the game.

When playing on Reincarnation difficulty you get the choice of buying the very OP Blessing: Lightning Messenger (After dealing a crit hit, inflict Shock)
Because this ability is so powerful it's worth refreshing or even restarting the run until you find a peddler who sells this particular blessing.

It's not hard to see how this would work incredibly well in combination
with the decay effect applied by the STING

• Elemental Synergy
  Shock + Decay = Miasma (Enemies take 12% Max HP as DMG/second)
  This elemental effect is the main reason this combo works so well. Enemies will take continuous damage while also being more vulnerable and slowed.
  
  
• Area of effect damage
  Every 3 shots the Sting will launch an explosive bolt that can deal damage to multiple enemies at once, it also removes armor from enemies.
  
  
• Relatively high RoF
  Very easy to hit weak spots and apply the elemental effects.

The most effective inscriptions are those that increase:
Stability, Rate of Fire, Lucky Shot and Elemental effect DMG/Chance

Can't find a decent Sting? - Alternative:
(Woodpecker) - Once in Act 3, equip a Woodpecker and link it together with Aura of Venom or Prism using an Elemental Sharing Gemeni. You just created a DIY Sting! (Kind of...)

Attention: Be careful NOT to deal damage with these pistol guns by accident! You are allowed to equip them into your inventory but CANNOT use them.

Essential
(Voltaic Aegis)
ALWAYS choose this, it’s your primary defense mechanism, without it you risk being one shot at the later stages!


Very good
All these increase single target damage, needed to kill Elites and Bosses
(Eye of the Storm)
Higher weapon DMG on Snipers


(Voltage Surge)
Higher Crit DMG


(Thunder Turbo)
Great synergy with Voltaic Aegis, Higher weapon DMG



Good - Bloody Drill
(Shadow Knight)
Higher weapon DMG, but might sometimes be difficult to keep enemies away from you when running solo

(Magical Supply) + (Storm Blast)
Increases DPS by keeping Fatal Current active after a kill. Great for snowballing but not very helpful when you are currently lacking damage.


Good - Sting
(Shadow Knight)
Higher weapon DMG, but might sometimes be difficult to keep enemies away from you when running solo

(Lightning from Void) + (Thunderbolt converter)
Even though Level 1-2 of are mediocre, Level 3 of Thunderbolt Converter is extremely good. Increasing weapon DMG by +100% and Lucky shot by +40% after hitting a Chain Lightning.

"+20 max shield, -50% shield recovery interval"
Very solid defensive enhancement because of the shorter shield recovery interval, You should probably pick this when given the choice.

"The shield will not be broken immediately after taking a shield-break damage, and the hero will be invincible for 2 seconds (CD: 180s)"
Despite the long cooldown this is a really good enhancement. Picking this talent will save you from a 1-hit deathblow in Boss fights, basically giving you an extra life!

“After casting Fatal Current, remove elemental effects immediately. In the next 2s, gain immunity to elemental effects and reduce damage taken by 60%”
Really great defensive enhancement when trying to get out of a sticky situation where you are being swarmed or taking damage from elemental effects.

"+0.3% permanent weapon damage after Crit. hit kill from more than 15m away"
Strongest offensive enhancement by far. In later stages this will be stacking up automatically since you will be further back. However, I’d rather go with a defensive enhancement to avoid getting killed, there are enough other ways to consistently increase weapon damage during the run.

"Start the game with a Patrimonial Sniper Rifle"
You are given a random Lv2 Sniper with 3 random inscriptions. There is a high chance of receiving an Exclusive one. This is a great choice when none of the above are available, especially if you are lucky and find a great Bloody Drill or Sting.

Pick a starting enhancement and weapon from the chest, if no sniper is available it’s best to RESTART. You will waste a lot of time using the foundry.

TIP: The Double Caliber is a great early pick-up due to it’s high RoF and no-scoping capabilities. Ideal for the more close-quarter combat in Act I

Deceivingly dangerous enemies: Bomber - Watch out when rushing the stage because they like to appear from around the corner. Zap them down with Chain Lightning (Q).
Longbowmen - Their homing arrows are very deadly, take them out as soon as possible.

Bosses: Want to make defeating the first boss easier? Spend some Copper on cheap upgrades for your first Sniper, even if you probably aren't planning on keeping it.


Ideally you should find and equip the Sniper Rifle you are going to upgrade and complete the run with somewhere in this act. (preferably the Bloody Drill or Sting depending on chosen strategy)

Deceivingly dangerous enemies: Arsonist - Kill this guy ASAP because once he gets in range, his flamethrower will melt through your shield/HP!
Magic Lizard - They will spray the battlefield with elemental effects, making it dangerous to move around. Better to take them out quickly.

Bosses: Large Sand Shrimp - Avoid the beam attack by getting close to its mouth and dashing forward sideways once it starts firing.

Wind God - Equip the foundry to increase movement speed while escaping the tornadoes.



These large, open stages make it easy to keep your distance. Just be careful of exploding lanterns swarming you, zap them down with Chain Lightning (Q).

Deceivingly dangerous enemies: Monk - Make sure they don't teleport next to you, luckily their massive heads are easy to shoot.

Bosses: Ship - Use the big cannon for cover when shooting the ship. Before fetching the cannonball make sure to clear some of the slowing jellyfish, then switch to the foundry for added movement speed.

Sea Serpent - The bleeding effect resets when the Serpent disappears under water. Most damage can be dealt by shooting the orange side of its body.


Don’t rush. At this point you deal a lot of damage but so do the enemies, keep your distance. Monkeys will always rush you, the best way of getting rid of them is probably hip firing.

Deceivingly dangerous enemies: Penguin and Penguin Cavalry - Kill these guys before they get into your face, just like the arsonist their attacks can melt HP quickly
UFO - Take these down quickly with Fatal Current to remove the enemy shields they provide.

Final Boss: Sadly the drill’s bleeding effect doesn't work in the final DPS Check phase (5% HP), Only thing you can do is shoot him in the face as much as possible and hope for the best.

Be careful when activating Fatal Current during the DPS check. (Unless you have Storm Blast or Thunderbolt upgrades) The activation time is long and might cause you to lose out on total DMG dealt during those 10 seconds.

---

• Avoid staying scoped-in for too long, be aware of your surroundings. Melee enemies will often try to flank you so stay vigilant.
  
  
• Keep moving as much as possible, strafe even when scoped in! Always invest in some mobility and dash Scrolls when given the chance.
  
  
  
• Reloading Snipers is slow, it's a good idea to pick up a Scroll that mitigates this issue.
  
  
• Don't hesitate to use Fatal Current defensively (Damage reduction and movement speed).
  
  
• When playing with Sting, it might be handy to keep a Bloody Drill or Piercing Flame as secondary weapon to penetrate Horsehead and Henchmen shields.

---

(つ ◕_◕ )つ Now go get that Frame!