collective of bone-shard abumi-guchis

The abumi-guchis wait impatiently for their fallen owners. The fur-pelt animals no longer stand for their master's fallen bodies, but for the fallen dreams, motives, and ideas. The abumi-guchis grow impatient, and light with a mark saying, "Avenge."
It takes just one to form the collective. The monster will dig in the graves of the fallen desperately and accumulate bones in an attempt to grow stronger. The moment one does, others follow, and band together to form a monstrosity of rage, hate, and ignorance growing upon the proportions of a kami.
They all form a collective based on anger and so fight for control of the beast, the bones they have accumulated ground to needles. Four of the abumi-guchis will gain control, forming four serpent-necks marked with two powerfully-lit eyes and a stripe of dimly-lit text saying "leader". They drop the fine, accumulation of bone on other spiteful pelt-monsters, which eventually join at the tail end to create an almost endless cycle of destructive anger without direction. For the living who wish to get back their pelt for a dream or motive, it isn't simple.
An attack cannot be made, for another abumi-guchi will just take power and the severed pelts will just accumulate bone shards. For those who want thier dreams and motives back, they need to throw away whatever weapon they use as a crutch. They must believe they can, be able to, and be brave enough to make the collective of bone-shard abumi-guchis shed the bone spires which keep it together, without physically touching it.