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Fatal Weakness is the Day 5 stage of Honkai: Star Rail's Stellar Shimmer event. Check out the best teams, how to beat Supergiant difficulty, and all the rewards in this Day 5 guide!
| Stellar Shimmer Event Guides | |||
|---|---|---|---|
Day 1 |
Day 2 |
Day 3 |
Day 4 |
Day 5 |
Day 6 |
Day 7 |
Day 8 |
| Stellar Shimmer Day 5 Premium Team | |||
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Boothill and Ruan Mei are the trial characters for Day 5.
A Super Break team composed of Boothill, Ruan Mei, Bronya, and Gallagher is recommended for Day 5. This team greatly boosts Boothill's Break Effect and grants him consecutive actions, which helps him break enemy weaknesses much faster.
| Support |
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If you don't have a built Gallagher, you can also go with healers like Huohuo or Luocha. Huohuo can regenerate Energy and buff ATK while Luocha can help bring down the toughness of Imaginary-weak enemies.
| Stellar Shimmer Day 5 F2P Team | |||
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In this F2P team, you can use the Imaginary Trailblazer to further increase Boothill's Break Effect and deal Super Break DMG. Natasha's Basic Attacks can also be used to chip away enemy toughness quicker.

The Day 5 stage mechanic features the Contusion debuff, which increases the damage taken by enemies and deals extra instances of Break DMG every time your team attacks.
Contusion stacks up when an enemy receives Break DMG, so it's best to break their weakness as soon as you can. Focus on enemies with more Contusion stacks to defeat them much faster!

You should ideally get a Weakness Break on Gepard before he's able to summon other mobs on the field. Try to buff Boothill's Break Effect through your supports as much as possible before it's his turn to attack!
| Trial | Character Build |
|---|---|
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| Stellar Shimmer Day 5 Stage Effect |
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| Enemy target's initial Toughness and Toughness Recovery Value decreases to 50% of their respective Max Toughness. Every time they receive Break DMG, receive 1 stack of Contusion, with each stack increasing DMG taken by 10%, stacking up to 10 times and lasting for 2 turns. After allies attack targets with Contusion, deal Break DMG equal to 100% of the attacker's Break DMG to the target. |
| Dwarf Star | • Eliminate 2 waves of enemies within 5 Cycles |
|---|---|
| Supergiant Star |
• Eliminate 3 waves of enemies within 6 Cycles • Eliminate 4 waves of enemies within 6 Cycles • Eliminate 5 waves of enemies within 6 Cycles |
| Enemy | Weakness |
|---|---|
| Enemy | Weakness |
|---|---|
| Challenges | Rewards |
|---|---|
| Complete the Fatal Weakness "Dwarf Star" mode challenge | |
| Eliminate 3 wave(s) of enemies in the Fatal Weakness "Supergiant Star" mode challenge | |
| Eliminate 4 wave(s) of enemies in the Fatal Weakness "Supergiant Star" mode challenge |
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| Eliminate 5 wave(s) of enemies in the Fatal Weakness "Supergiant Star" mode challenge |
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Fatal Weakness is the Day 5 stage of the Stellar Shimmer combat event. The Day 5 stage effects involve dealing Break DMG to build up Contusion stacks that increase your team's damage.

| Stage | Trial Characters |
|---|---|
Day 1 |
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Day 2 |
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Day 3 |
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Day 4 |
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Day 5 |
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Day 6 |
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Day 7 |
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Day 8 |
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Fatal Weakness Day 5 Guide



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