shield-reflection-dmg-writeup.txt

**Finding:**
Shields from different elements/characters/weapons provide different damage during Primo Geovishap shield reflect mechanic

Let's call damage dealt by this attack "Reflect".

Reflect values are (exactly!):
- Geo Shield (Noelle E) -> 15%
- Same element shield -> 15%
- Different element shield -> 5%
- Crystallized shield -> 5% or 15% - depending on element
- The Bell claymore -> 5%
- Noelle A2 passive -> 15%

When does reflect happen:
- Shield does not break -> reflect
- Shield pops on taking damage without death (like a2 noelle passive) -> reflect + knockback from getting hit (character)
- Shield pops on taking damage with death -> no reflect, shield sustains
- Shield breaks -> no reflect and you take the excessive damage
- Character too far away -> no reflect

Factors that do not affect the result (assuming shield will sustain)
- enemy resistances (VV shred)
- character level
- character defense
- character shield strength
- DEF% reduction applied to the enemy (c2 klee, c4 razor, a4 lisa) - tested c4 razor
- World Level, it's always 15% or 5% hp no matter the enemy level
- Co-Op (single player) affects the damage but only because of HP scaling - the damage is still 15% or 5% hp

Additionally in coop, if all characters have the same type of shield (C2 Diona, 4x Noelle with E up), the damage reflected is still the same. However, should there be more than one type of shields during reflect then the damage is summed. For example using Beidou E + Zhongli E on hydro Primo Geovishap reflect will result with 20% reflected damage.

During the first day of the event called "Legend of the Vagabond Sword" you could fight Primo Geovishap that changed infusions over time. In the settings you could pick "Reduce backlash dmg" setting, which resulted with this damage being lowered 3 times.

**Evidence:**
Based on datamined files, for level 93 primo geovishap, it has:
`(407.5199890136719 * 1930.0469970703125) = 786532.731042` HP
Therefore, 15% is `117979.909656` and 5% is `39326.6365521`.

Video showing 1 HP primo geovishap getting slain by Barbara  - <https://www.youtube.com/watch?v=rMmFso3YXkU>
Sequence:
`5% -> 5% -> 15% -> 15% -> 5% -> 15% -> 15% -> 5% -> 15% -> 5% -> 191` from barbara
`5*5% + 5*15% = 25% + 75% = 100%`, due to floating precision error, a single `1` hp damage would kill it

Hydro Primo Geovishap vs Xinyan - 5% - <https://www.youtube.com/watch?v=TwwpkLOsRTc>
Hydro Primo Geovishap vs Noelle - 15% - <https://www.youtube.com/watch?v=u-2c25xjgAk>
The Bell autoshield mechanic - 5% - <https://www.youtube.com/watch?v=fTRW0ksjtSs>
VV does not affect the damage - <https://www.youtube.com/watch?v=zeffceIjJ1I>
DEF reduction does not affect the damage - <https://www.youtube.com/watch?v=oQ6DxAZWAJ8>
Reflect has a range - <https://www.youtube.com/watch?v=LbaRkNlxky4>
WL does not matter - <https://youtu.be/47jIZOXjka4>
C4 Kaeya shield on-dmg taken - no dmg reflected due to shield being too weak - <https://www.youtube.com/watch?v=-IZwV5swjns>

Coop: 2x Zhongli, each with their own shield - 15% - <https://www.youtube.com/watch?v=2thu72alIcQ>
Coop: Beidou + Zhongli dealt 5% + 15% percent - <https://www.youtube.com/watch?v=d7q0MREFfhk>
Xinyan lvl 60, no artis/weapons - not enough shield hp for reflect - <https://www.youtube.com/watch?v=9IJMSL-hM8c>

Legend of the Vagabond Sword:
Noelle vs reduced backlash + 175% hp - <https://www.youtube.com/watch?v=MTvQ_AbdXag>
Noelle vs +175%hp - <https://www.youtube.com/watch?v=74ZkkfTy_tw>

**Significance:**
Might play a major role if at any point we'll have Primo Geovishaps inside the abyss and people will struggle with it.

Added

During the first day of the event called "Legend of the Vagabond Sword" you could fight Primo Geovishap that changed infusions over time. In the settings you could pick "Reduce backlash dmg" setting, which resulted with this damage being lowered 3 times.

and

Legend of the Vagabond Sword:
Noelle vs reduced backlash + 175% hp - https://www.youtube.com/watch?v=MTvQ_AbdXag
Noelle vs +175%hp - https://www.youtube.com/watch?v=74ZkkfTy_tw