Religion

N.B. This section is under construction.

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Deities
Religion is as important to the inhabitants of this world as it is to many others, however it takes different forms. The closest thing to a traditional organised religion is the Church of Equestria, though there officially isn't a deity - Celestia and Luna both vehemently object to being worshipped (which hasn't stopped it happening unofficially), though their divine power is undeniable. Instead, the Church preaches the values of friendship and harmony to anyone who will listen.

The Cervidans have a similar situation, in that their nation surrounds an entity known as the 'Great Tree' (among many other names). This entity takes the form of a gargantuan tree, on and around which is built the capital city of Concordia. The tree is considered by the Cervidans to be the center of the world, the anchor that holds reality together, and the origin of Nature. Similar to Celestia and Luna, the tree is a source of great divine power.

The only other (known) entity that could be considered deific is Discord. The manifestation of Discord has decided to 'take a break' for a while, but unfortunately he is still immensely powerful, and as such is a source of power for many clerics devoted to chaos.

Mechanical statistics:

These four entities are fountainheads of strength, powerful enough to be used as foci for divine magic. They are not the only sources of power for divine casters, however.

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Legendary Heroes
In this world, all sentient beings posses a vital 'energy'. It has many names, given to it by many cultures - commonly it may be referred to as a 'soul'. Made up of the raw 'stuff' of life that surrounds us all, it coalesces to form a person, then slowly dissipates after they die.

It doesn't simply disappear, though. It returns to the world, diffusing out through it like a glass of water poured into the ocean. For most, that's where it ends - their soul is irretrievable, and they go to rest. Some, though, are somewhat more tenacious. There have been creatures throughout history that hold such immense power within themselves that even long after their death their 'souls' can still be felt, never completely dissipating. They are most often characterised by the impact they had on the world, and their impossible deeds - hence the moniker 'Legendary Heroes'.

Someone skilled in divine magics can pick out the minute slivers of being, the delicate threads of what was once a soul, and pull on them - channelling these ancient heroes into divine spells. They have domains, alignments and favoured weapons like traditional deities, but other than that they are quite different. The existence of a hero is not inherently known - they have to be 'discovered', a process akin to finding a nearly-invisible needle in a haystack the size of the world.

Thankfully, in addition to their main activities, The Harmonic Order (an organisation of Harmonists) maintains records of known heroes and their legends.