Wow in depth, with enough info to base an entire campaign around. It's nice to see an unusual enemy that has a fresh approach to achieving their goals, and really make players struggle to get a grasp on their capability and motivations.
A couple quick ideas to improve the appearance/presentation:
Putting the headers such as appearance, confrontation etc.. in bold would help a bit to highlight the different sections of the article and make it easier to find a particular area when skimming during a game session.
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Also, putting a line break in between each plot hook and bolding their titles would make the last text area a bit easier to read/navigate. (as it is it's a bit of a wall of text towards the end)
A unique take on a gnomish subclass, and can make for a refreshing change in the usual wilderness encounter.
Perhaps giving them some type of musical related magic would help fill in the missing gap? Perhaps they have found a way to combine bardic magic with that of regular mages?
A song of burning passion may possibly set a target on fire, or one of a raging river make those enemies in ear shot feel as if they are drowning?
Giving them a little bit of offensive power (which they learned so they don't suffer the same fate as their ancestors) could make the odd group who looks at them as little push overs rethink their assumptions rather quickly. (Having a group of singing gnomes come to the rescue from a bandit ambush would also make for a fun encounter.
It's integral to the setting. Basically humanity was all humans until a virus, combined with the reawakening of magic across the world caused a % of humans to mutate into either Dwarves, Orcs, Trolls, or Elves.
The history of the setting goes on to mention that occasionally two parents one race will give birth to a child of a completely different race due to latent genes. (referred to as "spike babies.")
There's also a small % of people that undergo mutation during puberty from human to a different race because of the same latent genes.
I'll see about working a brief "as you know Watson" explanation into the back story for readers unfamiliar with the setting, thanks for the suggestion.
An interesting piece I'd like to see expanded upon and fleshed out more. (pardon the pun) For example, it's mentioned they are very knowledgeable, but where did they get the knowledge from? Did the lich have an old repository of arcane tomes in a library they;ve obtained access to? Or did the Lich imbue them with knowledge mystically?
I'm also curious back the back story behind how they first were discovered by the surrounding villages and befriended enough to be named grave born rather then feared as a village of "walking dead," especially due to their xenophobic nature.
It reminds me a little of the town of friendly ghouls players encounter in Fallout 2 near a nuclear reactor, which always stood out in my mind and one of the more unique encounters in an rpg game.
A useful 30 sub, with enough variety it's easy to find one that will fit their current campaign.
I especially like the ambiguity of these phropecies, a evil GM could simply toss a random phropecy into theri game near the beginning of the campaign and then watch the fun unfold as the PC's keep tryign to fit whatever events come to pass into the framework of the phropecy.
(Some of these work well for higher tech games too that still ahve phropecies and such, like the BSG rpg.)