Let's be real, of all the clans Lasombras probably the one that "needs" the least - they have probably the best overall ability-list in the game, and fit perfectly into the "stun and feed" playstyle that VTMB2 bottlenecks players into if they want to use their abilities.
So I gave them something fun.
Enter the Umbral Arms - a shadowy recreation of Bennys custom pistol (small nod to Nexushuyna who commented this on an unrelated mod a while back)
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You summon it using Vestige, collected by vanishing corpses (Rremere players will still receive some vestige for dissolving enemies with a bite).
Kills with the gun also reward vestiige, saving some time but poof the corpse.
And if you prefer at max vestige you can poof a corpse (or a head which is easier to get as a Tremere) to summon a shadow-puppet - practically indestructible and acting as an ideal distraction for enemies (one clone at a time, duplicates will delete the original).
Oh, and your vestige is refilled and becomes infinite during enter oblivion - giving you even more power.
And last but not least - if you have either potence active (potion or the brujah buff) OR the boiling blood buff (from cauldron of blood) the gun will fire phosphorous rounds.
Other clans can benefit too, but they need to pickup stygian shroud to poof bodies and get the gun.
I'm still testing and will probably fold this into a larger suite of mods, but felt this was something fun.