A cenotaph is an empty grave, tomb or a monument erected in honor of a person or group of people whose remains are elsewhere or have been lost.

6.6/Luna 7 Stygian bosses mechanics

Battle-Hardened Glacial Wolf: Glacial Soul (Wolf Local Legend)
The Wolf Clone and the Cryo shield get summoned at 1:54.
The self damage might be bugged at the moment, it doesn’t seem to do much no matter what is used.
It takes 6 Pyro swirls to break the shield, or 12 Electro swirls. You cannot break the shield in any other way.
It will redo the shield phase 50s after breaking the first one.

The Open-Eyed: Overbearing Contempt (The Watcher)
First Recording Phase at 1:54.
Second Recording phase at around 1:43.
Every Recording phase lasts up to 6s, if you don’t make it record an element in time, that star will become inert and much harder to break.
Hits required to record an element the first time: 5
Hits required to record the same element in the Second Recording phase: 15
Hits required to record a different element in the Second Recording phase: 5
For both Recording Phases, it can take into consideration multiple elements at the same time, what I mean by this is that it doesn’t get locked to the first element it comes into contact with, each element has a counter and the one that ultimately gets recorded is the first to reach 5/15.
A few seconds after the Second Recording Phase it will summon Elemental Stars of the recorded elements and start charging up an attack.
These Elemental Stars are immune to their own element and are permanently infused with it.
You have 17s to destroy the Elemental Stars.
It will redo the First Recording phase roughly 25s after breaking the Elemental stars.
This means that most encounters will have to go through 2 Elemental Stars phases, like most mechanics in Stygian.

IMPORTANT
Making it record 2 DIFFERENT elements makes the Stars “easier to break" (they have less HP).
When you break an Elemental Star, it will throw a Spear at the Boss and deal damage to the Watcher based on the damage dealt to the Elemental Star.
This damage is the same element as the Elemental Star’s, meaning that if for example you kill a Cryo star and then a Pyro one soon after, that second one will Melt thanks to the Cryo from the first one, potentially dealing a LOT of damage.

The ingame recommendation next to the boss’s name also recommends Vaporise and Melt, this is due to being able to double dip into these amplifying reactions by Vaping/Melting on the Elemental Stars for more damage and the self damage inflicted on the boss by them being able to Melt/Vaporise off of each other.