Just make it a scout/pathfinder class; some ideas off the top of my head to make this work:
The vet archetype now is a pure DPS class that can also focus on buffing allies and debuffing enemies either through generating inane amounts of dakka for the team or being a grenadier.
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Rework vet to no longer have camo and bio-optic targeting.
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Make all of his weapons only have irons, including the las guns.
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Give veteran a couple of new weapons, a autogun LMG, a lasgun LMG, a XM25-like grenade launcher with airburst prox nades, and rework one of the infantry autoguns to have an under barrel grenade launcher for its V attk.
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Rework suppression mechanics so suppression immune enemies are now affected, although they still can’t be suppressed, they now instead are debuffed by high suppression, like they take extra dmg or whatever.
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Automatic fire weapons generate suppression as most weapons do now, semi-auto only generate suppression on kill. Rework suppression blessing to simply be a boost to the weapons suppression stat, if on a weapon only capable of suppression on kill, now its suppression on proximity like automatics instead.
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Replacement feats for bio optic now instead boosts the team’s weapon suppression stat in coherency, and reduces the suppression, reduce durability dmg from ranged teamates take when in coherency with the vet.
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Replacement for camo gives the vet melee stagger and melee dmg resist on special kill for a set amount of time.
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Buff covering fire again. Have it give temporary suppression immunity to allies affected, like the weapon blessings. Grenades now also apply covering fire buff.
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Have bleed grenade feat give grenades extra suppression beyond its explosive radius.
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Buff extra ammo iconic feat to give the vet a deeper ammo pool.
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Nerf deadshot crit rate to 10 or 15% (from 25), but now has no stam cost on ADS, only on firing. Decrease stam cost by a further 5 to 10%.
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Volley ability now give increased movement on ADS (up to parity when not in ADS) too, refreshes dodges and gives +1 when using ranged weapons. Lasts longer, has lower dmg.
Ratling as noted is a scout class that can either specialize as a ranged assasin (sniper) or pathfinder/scout with info support abilities and coherency buffs.
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Ratling can parkour on climb points enemies use, allowing you to hang off of them briefly, or climbing up to places accessible only to enemies. Lightly highlighted to the ratling player.
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All weapons accessible to the ratling, besides class uniques, are scoped or have holosights. But does not have access to heavy weapons like the bolter or plasma, or the new weapons suggested above.
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higher base dodges, but only has access to light melee weapons, cannot use combat axes or chain weapons.
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coherency aura gives weakspot dmg buff to the team, and dmg against enemies marked by the ratling with mid mouse button or bio optic. Can also manually mark up to 4 specials, and allows allies to mark up to 1 additional special.
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Ratling gets camo as one of its iconic feats,
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Other iconic feat gives the team a mini map. All enemies within the ratling’s POV are show in allies’ minimap when in coherency. Icons and colors distinguish between enemy types.
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Team support feat section has three variants of bio optic targeting for the ratling, one highlights all non ogryn/mutant/bomber specials for everyone. Other highlights shooters plus regular specials as above. Third highlights only ogryns, bombers and mutants, and gives bonus melee dmg to allies in coherency. Maybe one of them also allows you to see where monstrosities (demonhosts included) will spawn
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Ability and lvl 30 feats are the same as vet, but now also confer a fraction of the same advantages to allies within coherency on activation. Does not stack for vets, only stacks once for other ratlings.
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Only can passively restore durability, but ranged attacks restore ally durability, basically has a slightly weaker covering fire feat as a iconic feat.
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Blitz feat is a grappling hook that either stuns an enemy, allows you to briefly get ontop of an ally or allows you to pull yourself to a parkour point, has limited uses, replenished by nade boxes.
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Volley equivalent works like vet’s, but bio optic feats decide what is marked instead. 1st lvl 30 feat instead of working like sustained fire, instead increases duration, and replenishes grappling hooks and allows you to hang off the roof for the duration of the skill. 2nd instead increases reload rate, and increases the penetration of your ranged weapon, certain weapons reach bolter and plasmagun level penetration of all cover. 3rd gives additional dmg, and degrades all marked enemy armor by 1 tier (eg. carapace>flak, etc.).
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Have a feat that gives either nightvision or IR on ADS for yourself and friendlies on coherency.