This model doesn't really have a great starting point, haha. We started with the Monolith, just because Szarekh plus the Menhirs is 26 wounds, which is pretty close to the Monolith's 24. Past that, it gets a little tricky. The base profile we translated using our standard Apocalypse conversion guidelines.

For PL, The Silent King is 4 more PL than a monolith in 9e, so we kept that difference the same, and made it 21 PL in Apoc

Noctilith Beacons - Skipped, since denying psychic powers isn't a direct thing in Apoc.

Obeisance Generators - these kind of Fight Last effects are normally translated as "-1 to hit with melee attacks", so that's what we did here. See the Foul Blightspawn for reference.

Phaeron of the Stars - translates over pretty smoothly. We skipped the Core limitation, since that isn't a thing in Apoc.

Phaeron of the Blades - translates over pretty smoothly. We skipped the Core limitation, since that isn't a thing in Apoc.

Relentless March - translates over pretty smoothly. We used the Noxious Blightbringer's "Tocsin of Misery" as our template, and skipped the Core limitation, since that isn't a thing in Apoc.

My Will Be Done - translates over pretty smoothly. We skipped the Core limitation, since that isn't a thing in Apoc. We also removed the "pick a unit" part, which probably makes this super duper OP. Oh well. He is a Phaeron, after all.

Voice of the Triarch - Since Command Protocols are not a thing in Apocalypse, we decided to give him the equivalent of the Deceiver's "Grand Illusion" ability, but tweak it to allow him to use it on other detachments.

Triarchal Menhir - This can be mostly skipped, since we are considering them all to be one unit. Instead, we changed it to "This unit does not count as a CHARACTER for the purposes of the Sniper keyword whilst it is not critically damaged."

The Silent King - Ported this straight over, since Fundapocalypse uses command points. If you don't use the Fundapocalypse rules, he should just draw you extra cards.

Transtemporal Force Field - Accounted for by giving him a 5+ save

Preservative Auto-torpor - Pretty much pulled straight over, but made it care about "Critically Damaged" instead of wound counts. We also turned off the Annihilator Beams to account for the Menhirs being "dead" when the unit is critically damaged.

Vengeance of the Enchained - Skipped, he isn't super heavy, so he doesn't explode.

Annihilator Beams

The Annihilator Beams profile is really close to the Monolith's Particle Whip, except it does a flat 6 damage. We decided to give it almost the same profile, add add Destroyer. The only change we made was worse SAP, since it has fewer shots than the particle whip does.

Sceptre of Eternal Glory

The Sceptre's shooting profile is a tricky profile. There isn't another thing quite like it in the Necron codex, though it is basically just a supercharged plasma gun with three shots instead of 1. We decided to start with the twin plasma gun profile from the Rhino Primaris, add 1 to SAP and SAT since it is "supercharged", then add 1 more to SAP since it is 3 shots instead of two. Close enough for us.

The Melee profile ends up with almost the exact same statline, except it is 6 attacks instead of 3. We kept the same profile, and set the attacks on The Silent King to 2 to handle it. ezpz.

Staff of Stars

The shooting profile on the Staff of Stars is very similar to an Onslaught Gatling Cannon - it has 1 more shot, 1 more strength, and 1 more AP. We just gave it the same profile, and ticked the SAP and SAT up by 1.

The Melee profile is a weird one - its just a free extra 3 attacks. That basically makes it half of an Onslaught Gatling Cannon, so we just gave it the same profile, except with only 1 attack.

Scythe of Dust

For this profile, we again turn the the Space Marine codex. The Scythe of Dust is almost the same as a supercharged Heavy Plasma Cannon - the only differences are 1 more AP, and it is 4 attacks instead of d3. Since this is such a cool weapon, we kept it simple, and just made it a Melee Supercharged Heavy Plasma Cannon with 2 attacks. Neat!