dimensions

in hvoe, there's two main dimensions, the soulscape/incorporeal and the corporeal (sometimes nicknamed meatscape. good ole meatscape). they intersect and cannot exist without the other. the intersection between them is where all creatures exist.
the soulscape is where many mystical things are possible. it is majority energy-based with its structure being controlled by the matter from the corporeal realm. the corporeal realm, in contrast, relates to matter, which is given energy from the soulscape.
everything, to some extent, exists in both dimensions. however, depending on a creature, it may have more domain in one or the other.
for example, humans are almost half and half, with their minds in the soulscape and their bodies existing in the corporeal realm. the connection between the two realms, in humans, is very small, so they cannot travel closer to one or the other.
unbound entities are largely in the soulscape, but can be give influence in the corporeal world through a human soul.
bound entities develop a stronger connection between the corporeal and incorporeal than humans. this is what allows them to see unbound entities, and summon abilities from the soulscape.
as a bound entity ascends ranks, it develops an even stronger connection, being able to freely move between the two domains and gaining abilities from both.

Because humans have equal domain between corporeal and incorporeal, many angelic and demonic attacks will not hit them. For example, being sliced by an angelic weapon would feel similarly to being hit with a blast of air.

The larger the difference in domain between dimensions, the greater vulnerability a creature has, because it can be destabilized easier.

halos and horns

bound angels form halos, and bound demons form horns. these are a part of their body, and are essentially the source of an entity's power. this post is just to detail some of the abilities of halos and horns, respectively.

halos:
-allow communication between angels within the same zone
-call unbound angels to an area
-act as a small portal to the soulscape (it cannot necessarily transfer someone's body to the soulscape, but instead allow them to borrow energy from it or put things into it)
-can be transformed into a weapon form. this weapon form can separate energy from matter and banish it to the soulscape. (this turns the energy into vessel-less souls; the matter will dissipate and be returned to the earth.)
-look really cool
-could probably be bent into cool shapes

horns:
-allow communication between demons in the same zone
-control unbound demons in the area
-act as a small portal to the soulscape
-can be transformed into a weapon that can separate matter from energy and banish it to the corporeal realm. (essentially, demonic weapons will cause something to become a soulless husk. the energy will dissipate and be used in other creatures.)
-look really cool
-cant be bent into cool shapes. haha suckers

while similar, there are clearly some differences between them. its fun

ranks

this is a rundown of the ranking of angels and demons in hvoe. its not really important to know the names.

The top of the angelic rank is God. It isn't certain that God is an angel at all. God creates the majority of angels and dispatches them as necessary. God has immeasurable power.

theta angels: administrative angels that oversee other angels. they have massive amounts of power and can control other angels. considered second-in-command.

gamma angels: employed in swarms to handle outbreaks of demons. could be thought of as an angel task force. are highly specialized in their abilities to handle soulscape or corporeal power.

sigma angels: angels that have a great deal of power. administrate delta angels and preserve the safety of purified areas through noncombatant means.

delta angels: angels that oversee a larger area than tau angels. they can oversee tau angels in their region, but they also are obligated to eliminate demons as necessary.

tau angels: largely considered the "first bound angel", but considered a rank above accidental angels. many populate a small area and eliminate demons through combatant or non-combatant means. they are obligated, but not required, to follow instructions from higher angels.

nu (accidental) angels: unstable formations of humans and angels. occurs when a human attracts and absorbs a compatible angel, binding them together. they tend to be incomplete, and may not even realize that they are angels. they have similar abilities to tau angels with less power.

angels rank up by proving themselves "worthy". whatever that means...

rather than ranks like angels, demons are organized in subsets based upon the main sin they embody. there are very powerful demons for each sin, which influence bound demons of their sin, who have control over unbound demons in their vicinity.