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As an experiment, and possibly a preface to porting in more of the Forge World Custodes content, have some rules for the Custodes Dreadnaught collection (based on the rules in Inferno and the upscale Dreadnaughts in the 8e Imperial Armour index):

Contemptor-Achillius Dreadnaught (Elites) (PL 16)
Move 9", WS 2+/3+/4+, BS 2+/3+/4+, S 7, T 7, W 12, A 5/4/3, Ld 9, Sv 2+ (Wounds thresholds 7+/3-6/2-)
A Contemptor-Achillius is a single model. It is equipped with two Dreadnaught close combat weapons and two Lastrum storm bolters.
Options:
May replace either Lastrum storm bolter with a twin adrathic destructor or an Infernus incinerator.
May take an Achillus dreadspear and a las-pulser.
Abilities:
Refractor Field: This model has a 5+ Invulnerable save.
Preturnatural Skill: Excess damage from this unit's melee attacks is not lost; instead keep allocating damage to another model in the target unit until all damage has been allocated or the target unit has been destroyed.
Unstoppable Fury: This model may reroll hit rolls of 1 in the Fight phase.
Relic of Ancient Glory: Roll a d6 each time this model loses a wound. On a 6+ the damage is ignored and the wound is not lost.
Explodes: If this model is reduced to 0 Wounds roll a d6 before removing it from the battlefield. On a 6 it explodes and each unit within 6" takes d3 mortal wounds.
Faction Keywords: Imperium, Adeptus Custodes
Keywords: Vehicle, Dreadnaught, Contemptor-Achillus

(Contemptor-Achillus Wargear
Achillus Dreadspear: Melee, S x2, AP -4, Damage 3, Impaling Strike: This weapon inflicts 6 damage instead of 3 on to-wound rolls of 6 if the Dreadnaught charged this turn.
Dreadnaught Close Combat Weapon: Melee, S x2, AP -3, Damage 3.
Infernus Incinerator: 12", Assault d6, Strength 6, AP -1, Damage 1. This weapon automatically hits.
Las-Pulser: 36", Heavy 2d3, Strength 9, AP -3, Damage d6.
Lastrum Storm Bolter: 24", Rapid Fire 2, Strength 5, AP -1, Damage 1. Heliothermic Detonation: On a 6 to wound this weapon inflicts 2 damage rather than 1.
Twin Adrathic Destructor: 12", Assault 2, Strength 7, AP -3, Damage d3. When rolling damage with this weapon roll twice and pick the highest.

Contemptor-Galatus Dreadnaught (Elites) (PL 16)
Move 9", WS 2+/3+/4+, BS 2+/3+/4+, S 7, T 7, W 12, A 5/4/3, Ld 9, Sv 2+ (Wounds thresholds 7+/3-6/2-)
A Contemptor-Galatus is a single model. It is equipped with a Galatus warblade and a twin Infernus incinerator.
Options:
None
Abilities:
Preturnatural Skill: Excess damage from this unit's melee attacks is not lost; instead keep allocating damage to another model in the target unit until all damage has been allocated or the target unit has been destroyed.
Dreadnaught Praesidium Shield: This model has a 4+ Invulnerable save. Enemies take a -1 penalty to hit this model in melee.
Relic of Ancient Glory: Roll a d6 each time this model loses a wound. On a 6+ the damage is ignored and the wound is not lost.
Explodes: If this model is reduced to 0 Wounds roll a d6 before removing it from the battlefield. On a 6 it explodes and each unit within 6" takes d3 mortal wounds.
Faction Keywords: Imperium, Adeptus Custodes
Keywords: Vehicle, Dreadnaught, Contemptor-Galatus

(Contemptor-Galatus Wargear
Galatus Warblade: Melee, S x2, AP -4, Damage 3.
Twin Infernus Incinerator: 12", Assault 2d6, S 6, AP -1, Damage 1. This weapon automatically hits.

Telemon Heavy Dreadnaught (Heavy Support) (PL 20)
Move 8/5/3", WS 2+/3+/4+, BS 2+/3+/4+, S 8, T 8, W 14, A 5, Ld 9, Sv 2+ (Wounds thresholds 8+/4-7/3-)
A Telemon Dreadnaught is a single model. It is equipped with two Telemon Caestus with inbuilt Proteus plasma projectors and a Spiculous bolt launcher.
Options:
May replace either or both Caestus and inbuilt plasma projectors with an Arachnus storm cannon.
Abilities:
Preturnatural Skill: Excess damage from this unit's melee attacks is not lost; instead keep allocating damage to another model in the target unit until all damage has been allocated or the target unit has been destroyed.
Multi-layered Refractor Field: This model has a 4+ Invulnerable save.
Unyielding Sentinel: Roll a d6 each time this model loses a wound. On a 5+ the damage is ignored and the wound is not lost.
Atomantic Conflagration: If this model is reduced to 0 Wounds roll a d6 before removing it from the battlefield. On a 5 or 6 it explodes and each unit within 9" takes d3 mortal wounds.
Faction Keywords: Imperium, Adeptus Custodes
Keywords: Vehicle, Dreadnaught, Telemon

(Telemon Wargear
Arachnus Storm Cannon: Must choose one of the following modes when firing (must choose the same for both if the model has two): Concentrated Fire: 72", Heavy 2, Strength 9, AP -5, Damage d6. If you roll a 6 when inflicting damage this weapon inflicts a mortal wound in addition to normal damage. Burst Fire: 48", Heavy 7, Strength 7, AP -3, Damage 2.
Proteus Plasma Projector: 8", Assault d6, Strength 7, AP -4, Damage 2. This weapon automatically hits. If you roll a 1 when determining the number of shots this weapon gets the Dreadnaught takes a mortal wound after you resolve the attack.
Spiculous Bolt Launcher: 48", Rapid Fire 5, Strength 5, AP -1, Damage 1.
Telemon Caestus: Melee, Strength x2, AP -4, Damage 4. If you roll a 6 to wound with this weapon it deals 6 damage instead of 4.

There we go. Incredibly expensive, reasonably durable, at least semi-mobile, and hilariously destructive.