The planes of existence are different realities with interwoven connections. Except for rare linking points, each plane is effectively its own universe with its own natural laws. The strength of the walls between different planes is different in different locations.

But in general the whole world of Myaasia is a place with weak walls, making Magic, transplanar travel and summoning in many insances too easy. As most magic is the application of Elemental planes or emotion planes.

These support life in much the same way as is familiar, utilizing solar light, food, water etc. But many have striking differences in the flora and fauna present, the existence and power of magic present , natural law and many other things.

What makes a plane a prime is the fact that the six building blocks are all present and mostly in balance. Further the corresponding spirit planes are in reasonably balanced between the different emotions.

These planes are the source of mages power and each has one of the six natural forces that make up the primes.
Thus: plane of earth,fire,air,water,life,unlife.
No beings from Primes can survive here, except with help of protecting spells, but beings from these plane can usually survive on primes, atleast a short time since their element is part of the prime mix.

These are the planes “Superimposed” on the Primes and thus quite close, so strong spirits can reach over. There exists one for each prime.

Each living being has two parts, the body and the soul.
Body consists of the part on the Prime and soul in a Spirit plane. A living being has a strong link to his soul and thus is alive. When someone dies, the soul “hovers” around with the link cut, and the wall gets stronger and stroneger for that spirit depending on the time spent dead.
Thus someone who has been dead a short time and raised , might “remember” events happening close to him while he was dead, but these will allways be hard to interpret. The longer one has been dead the harder it is to create the link to the boby and the less the being is aware of events.

planes making up the building blocks of the soul planes, the same way the elemental planes make the building blocks of the primes.
These planes are filled with pure emotions. Thus a mage casting a charm or fear spell actually opens a minor gate to the appropriate emotion plane, and a Barbarians rage is training his soul to tap the right emotion plane to help.

The void consist of a myriad of planes each different from other and most too foreign for people of the prime planes to comprehend. Only the six pales and few others are even close to understandable, with the Essaence planes being barely on the other side of understandable. The pales and the other understandable planes are mostly so because the mind of humanoids “edits” perceptions so that things seem more familiar.

Most of these are created by a big unbalance of either the 6 building blocks or the presence of a soul plane that is too unbalanced in some emotions.

All beings and things natually belonging to the primes have some part of earth, fire, air and water. Beings with souls furhermore incorprate either life (for living beings) or unlife (for undead beings) into the body, the soul keeping the thing together. Basically the body is animated by the soul, existing on the corresponding soul plane.

When the body is damaged it looses part of its life (or unlife), as this progresses the link to the soul gets weaker, and finally “snaps” at death. The hitpoints represent the ammount of life force left.

Even a dead body has some life (or unlife) left but not in sufficent quantities for the soul to hold on to.

Lifegiving recreates the link and channels some of the life force to the body.

Healing spells work by channeling life element to the body and natural healing by the slow gathering of the life force by the soul to the body.