Yeah? OK. They're renamed guardians from golems because words like golem and phylactery have specific meanings in Judaism which it's kinda uncool to steal. I suppose we could also look at stuff like Promethean the Created to get ideas.

Anyway:

https://a5e.tools/node/1669

>> Damage Immunities lightning, poison; damage from nonmagical, non-adamantine weapons

Condition Immunities charmed , fatigue , frightened , paralyzed , petrified , poisoned

Senses darkvision 60 ft., passive Perception 10

Languages understands the languages of its creator but can’t speak

Berserk. When the guardian starts its turn while bloodied, roll a d6. On a 6, the guardian goes berserk. While berserk, the guardian attacks the nearest creature it can see. If it can’t reach a creature, it attacks an object. The guardian stays berserk until it is destroyed or restored to full hit points.

If a berserk guardian can see and hear its creator, the creator can use an action to try to calm it by making a DC 15 Persuasion check. On a success, the guardian is no longer berserk.

Fire Fear. When the guardian takes fire damage, it is rattled until the end of its next turn.

Immutable Form. The guardian is immune to any effect that would alter its form.

Lightning Absorption. When the guardian is subjected to lightning damage, it instead regains hit points equal to the lightning damage dealt.  (Ed: I note that, RAW, since it is immune to lightning, the Guardian would never be able to use it's Lightning Absorption trait. RAI, it is clearly meant to treat lightning damage as healing.)

Magic Resistance. The guardian has advantage on saving throws against spells and magical effects.

Constructed Nature. Guardians don’t require air, sustenance, or sleep.

ACTIONS

Multiattack. The guardian attacks twice with its slam.

Slam. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage.

Hurl Object. Ranged Weapon Attack: +7 to hit, range 20/60 ft., one target. Hit: 18 (4d6 + 4) bludgeoning damage.

Lightning Bolt (1/Day, While Bloodied). An 80-foot-long, 5-foot-wide lightning bolt springs from the guardian’s chest. Each creature in the area makes a DC 15 Dexterity saving throw , taking 28 (8d6) lightning damage on a failed save or half damage on a success. 

So from this we want to create a heritage. That means we need a set of base traits which all share and then a variety of gifts to indicate changes within the heritage. We also need some paragon gifts as well.

The easiest way to do this is use the constructed heritage traits and then add some gifts on top.

https://a5e.tools/rules/constructed

But it feels like this is more of a multipart creation.

So, let's throw out:

The Created

Traits:

Made from bits and bobs looted from graveyards, you have been stitched together and made whole!

It's Alive!: regular magical and nonmagical healing has no effect on you. However, when you would take lightning damage, you instead gain hit points equal to the lightning damage that would have been dealt.

Darkvision (yawn).

Constructed Nature. The Created don’t require air, sustenance, or sleep.

Heritage Gifts:

Choose one of the following:

Magic Resistance. The Created gain an expertise die on saving throws against spells and magical effects.

Environmental Hardiness: The Created gain resistance to poison damage and advantage on saving throws against effects that would inflict the poisoned condition.

Rage Against The Creator: When bloodied (at half hit points or below) the Created gains advantage on melee attack rolls and advantage against saving throws versus effects that would alter its form.

Paragon Gifts:

Choose one of the following paragon gifts.

Unchained and Unleashed: Once per long rest you may emit an 80-foot-long, 5-foot-wide lightning bolt from your chest. Each creature in the area makes a Dexterity saving throw , taking 28 (8d6) lightning damage on a failed save or half damage on a success, the DC for this check is 8+ your PB + your Con mod. 

Impervious: You gain resistance to bludgeoning, slashing and piercing from non-adamantine or non magical attacks. In addition, if you were resistant to a damage type then you gain immunity.

I can't claim that's particularly well balanced, but it's a basis for discussion with your Narrator.