I recommend to read this post in dark mode.
Hello and welcome to this Life Harvester's Song / Life Harvester's Path: Shared Destiny review!
I hope I'll be able to help you, let's start~
Note: This guide is based on the BETA. Officially released content might differ.
✦ Table of contents ✦
Source
Stats, Skills, and Buffs
Weapon comparison
SP considerations
Gameplay
Conclusion
✦ Source ✦
Life Harvester's Song is an gacha-only weapon for now.
In 6.8 it'll have its first supply:
You're guaranteed to get one gear piece (includes Stigmata and weapon) every 50 pulls,
meaning you're guaranteed to get the weapon within 200 pulls.
On the global servers, this banner releases on August 3rd and end on September 1st.
Life Harvester's Path: Shared Destiny can be crafted after obtaining Life Harvester's Song.
✦ Stats, Skills, and Buffs ✦
✧ Non-PRI: Life Harvester's Song ✧
Buffs provided
User bonus
✧ +12% Physical DMG
✧ +12% Physcal DMG taken by enemies while the user is in Herrscher form
Team bonus
✧ +5% Physical DMG
✧ +10 SP when exiting in Herrscher form (15s CD)
Weapon Active
On Herrscher of Rebirth
Soul Shaper form
SP: 0 | CD: 18s; isn't affected by CD reduction
+ Joint Weapon Skill
Life Binder form
SP: 0 | CD: 18s; isn't affected by CD reduction
+ Joint Weapon Skill
+ Joint Weapon Skill
On other characters
SP: 0 | CD: 15s
Deal 800% ATK of Physical DMG10
✧ PRI: Life Harvester's Path: Shared Destiny ✧
+ Joint Weapon Skill
+ Joint Weapon Skill
Buffs provided
User bonus
✧ +20% Physical DMG
✧ 15% Crit Rate
✧ +20% Physcal DMG taken by enemies while the user is in Herrscher form
Team bonus
✧ +10% Physical DMG
✧ +10 SP when exiting in Herrscher form (15s CD)
Herrscher of Rebirth bonus
✧ If she hits an enemy with any Joint ATK, all Ultimates deal 200% bonus ATK of Physical DMG against enemies affected by Withering Frissure
Weapon Active
Effects on Herrscher of Rebirth stay the same.
On other characters
SP: 0 | CD: 15s
Deal 1000% ATK of Physical DMG
+ Joint Weapon Skill
✦ Weapon Comparison ✦
✧ Support Seele ✧
There's no other weapon that provides any supportive buffs, so let's skip that part and head on to the DMG comparison
+ Joint Weapon Skill
The DMG loss is pretty low.
DMG wise her signature weapon is definitely replacable when playing her as support.
test detaiIs
*Weapon changed out to the weapon shown
Dreamweaver
S0 rank, 1318 ATK
59,1 ATK; 5,21 crit DMG; 12 Crit Rate from affixes
Terminal Aide 0017
SSS rank; 1241 ATK
95,1 ATK from affixes
Rotation:
HoRb Evasion - Basic ATK x 4 - Combo ATK - Joint Combo
TA QTE - Ultimate - WA
HoRb Ultimate - WA
DW QTE - WA - Basic ATK - WA - Ultimate - WA - Charged ATK - Basic ATK x 4 - Charged ATK - Finisher
TA QTE - Ultimate - WA
HoRb QTE - Joint Combo
DW QTE - WA - Basic ATK - WA - Ultimate - WA - Charged ATK - Basic ATK x 4 - Charged ATK - Finisher
✧ DPS Seele ✧
+ Joint Weapon Skill
DMG wise you will definitely feel the difference.
Especially when you don't have Acheron either.
test detaiIs
*Forgot to make a screen at first, HoRb was S0 rank at the time of the test
Terminal Aide 0017
SSS rank; 1241 ATK
95,1 ATK from affixes
Ruler of Sentience
S2 rank (due to it being free), 1254 ATK
No Stigmata provide any ATK/DMG
QTE turned off
Ruler of Rebirth
S0 rank
No Stigmata provide any ATK/DMG.
Rotation:
HoS Evasion - Spear Combo ATK (Evasion trigger)
TA QTE - Ultimate - WA (SP Skill)
HoS Chain Combo ATK - Ultimate
HoRb QTE - Ultimate - WA - Joint Weapon Skill (full 4s) - (Ultimate) - Basic ATK until full Herrscher Charge - Combo ATK
✦ SP considerations ✦
The weapon provides 10 SP every rotation for Herrscher of Rebirth and Herrscher of Sentience.
For now it's only some details, feel free to skip to the analysis if you only wanna know about how important this SP effect is.
✧ Support Seele ✧
In the following I'll repeat her normal rotation 4 times and write down how many SP I had each time when using their Ultimate and any changes in the rotation I made to increase the SP recovery.
Start with 90 SP.
Please note HoRb only needs her Ultimate every 2 rotations.
Signature weapon | Path of Acheron
Rotation 1
Herrscher of Rebirth: 187 | 177
Rotation 3
Herrscher of Rebirth: 179, switch in and instand swich to Prom | 182, switch in + Evasion + Basic ATK x3
✧ DPS Seele ✧
In the following I'll repeat her normal rotation 4 times and write down how many SP I had each time when using their Ultimate and any changes in the rotation I made to increase the SP recovery.
Start with 90 SP.
Usually HoS does two Combos each rotation, with one being the Spear Combo triggering her UE with an instant swich out
Signature weapon | Path of Acheron
Rotation 1
Herrscher of Sentience: 169 | 169
Herrscher of Rebirth: 120 | 110
Rotation 2
Herrscher of Sentience: 150 | 140
Herrscher of Rebirth: 121 | 101
Rotation 3
Herrscher of Sentience: 135 | 125, additional Combo and later Spear Combo switch out
Herrscher of Rebirth: 123 | 93
Rotation 4
Herrscher of Sentience: 127, one additional Combo | 125, two additional Combos
Short Note: Usually the second additional Combo would be done in rotation 1 or 2 so Basic ATKs for kinetic energy is not needed
Herrscher of Rebirth: 125 | 85
✧ Analysis ✧
In her Support form, replacing Seele's weapon won't be that big of a problem.
The first two rotations don't get slowed down at all, and the third rotation will only remove the overall abyss score by ~5 points.
Besides for that, many bosses drop SP packs. 1-2 SP packs allow you to instantly switch to Prom after your second rotation, ending up in the only point decrease being the DMG loss of alternative weapons.
In her DPS form, replacing Seele's weapon doesn't stop her from using her Ultimate every rotation unless you need 6 rotations or more.
The main issue here ends up being Herrscher of Sentience.
Even if you only need two rotations, you can safe some time with her. Herrscher of Sentience can have big SP issues overall, which you especially feel in the third+ rotation without Harvester's Path.
If you have Harvester's Path though, Herrscher of Sentience's rotations will go much smoother.
In fact, many runs use Domain of Sentience instead of Cosmic Duality when using Harvester's Path due to the SP restored from Harvester's Path and Herrscher of Rebirth.
Overall, Harvester's Path is a huge help with HoS' SP
✦ Gameplay ✦
Original video creator: Inari Gaming (YouTube)
Thanks for letting me use your videos once again 
✦ Conclusion ✦
When only playing Herrscher of Rebirth as support, the weapon is not needed.
The DMG loss is rather smalll and the point loss coming from SP farming is not as big either, the first two rotation in fact don't lack in SP at all.
In case you're planning on playing Herrscher of Rebirth as DPS, the weapon is pretty much a need to have.
It doesn't only provide a good amount of DMG, but also solves HoS' SP issues.
Overall it's a really good weapon and I definitely recommend you to get it! 
Credits
- Thanks to Cyxo who sent the Valkyrie/Stigmata icons to me and thanks to Alpaca who cut these out / corrected them and so on
- Thanks to Inari(YT link) for the video examples
- Website for official wallpapers in case you're interested, here
Thanks for reading my guide, I hope I was able to help you!
Have a great day 
EU/UID: 203184518
