Where Shadows Lurk and Darkness Dwells

In an alternative version of Earth, humanity's been close to decimated by two large calamities, separate in time, with the span of a hundred years between them.
Much was lost, other than lives, but much was also gained.
Resources, civilisation, techonlogy, all these dwindled to near-nothing, but on advent of the First Calamity, magic came. And the few who could hold it in their hands, soon learnt how they could use it to their gain - and to help the fate of mankind.
Or so they said.
With great power comes great responsibility, but also greed and ambition. Now that nature had been conquered by the magical powers of those who carried that trait, they started looking elsewhere. Sickness, diseases, ailments big or small, these could all be eradicated. Given time, even death could be conquered, and immortality claimed!
Unable to realise they were about to release a Second Calamity upon the world, those powerful scholars pursued their goals, with no regard for the consequences.
And these were worst than they could have imagined - for the dead started raising from their graves and preying on the living. Some of them were even sentient.
Years into the advent of the Second Calamity, mankind has devised ways of protecting those without powers, by use of the ones imbued with magic. Under the flag of the Confederation of Nations, hunters, scholars, healers, spellcasters, are trained and brought together in Covenants that fight the undead and make the world safer.
But when the lurking creatures start acting out of character and unexpected events begin to take place, can the Confederation still be trusted?
Follow the Quarter Moon Covenant as they hunt the monsters who seek to destroy them and struggle to understand what secrets have been kept from them.
And from the whole of humanity, as well.