[Bites] Havoc Archetype

I'm working on the Primaris stuff but also run an irl Black Crusade game on the side. Now one of my new players wants to play a Havoc, so I made him this quick and dirty starting Archetype, roughly equivalent to the Chosen.

Havoc

All Havocs are Chaos Space Marines.
Havocs gain the following:

Skills: Scholastic Lore (Tactica Imperialis), Athletics +10 OR Intimidate
Talents: Jaded OR Disturbing Voice, Iron Jaw OR Cold Hearted
Starting Gear: Legion Heavy Bolter with the Belt Feed Upgrade and Ammo Glutton Downgrade
Wounds: 16+1d5
Havocs start Unaligned

Havocs gain the following 2 special abilities:
Special Ability: Immovable Warrior
When wielding a Heavy weapon, the Havoc may either brace the weapon behind cover as a Free Action, or steady himself as a Half Action. While braced or steadied, he gains +20 to resist Grapple or involuntary movement, and a +10 bonus to all Ballistic Skill Tests made with that weapon.
This benefit is lost if the weapon is no longer braced or if the Havoc moves from his current position.

Special Ability: Unrelenting Devastation
When firing a Heavy weapon, the Havoc inflicts +1 additional damage to a Horde’s Magnitude for each hit inflicted. If the weapon has the Blast Quality, he instead inflicts +1d5 additional Magnitude damage after all hits have been resolved.