cambions

many cambions are half-drow. many others are half-duergar. this is is due those races' close association with devils.

EDIT: yet other cambions are half-goblinoid (most typically, half-hobgoblin).

the ghoul king

was an orc.

many, although not necessarily most, ghouls were orcs.

if i could change some classes

sorcerer
con attack stat
chaos, int secondary stat (genasi) (rename chaos sorc to elemental sorc)
dragon, cha secondary stat (dragonborn)

warlock
cha attack stat
infernal, con
star, con
fey, int

paladin
str attack stat
leader secondary role, wis secondary stat
striker secondary role, cha secondary stat

more on orcus

orcus' official relationship with undeath has been understated. orcus was the first undead. he is the master of the domain of undeath. he created most of the types of undead creatures.

it is believed that orcus, at some time after changing from a primordial into a demon lord, did battle in the shadowfell with one or more gods and was destroyed. for reason not as yet understood nor repeated, the necrotic energies of the shadowfell infused orcus' corpse and brought him from a state of death to undeath. although, orcus was soon after repelled from the shadowfell, he has forever remained obsessed with that plane, and the shadowfell's necrotic energies have played a pivotal role in the creation and existence of multitudes of undead creature types.

as i have mentioned in a prior post, orcus seeks to turn all living creatures in undead; thereby, obtaining dominion over all creatures.

on hags and trolls

as i have mentioned previously, trolls are, as i see them, fey creatures. they are closely aligned with hags. curiously enough, although trolls and hags are separate races, they somehow procreate together. there are no male hags and there are no female trolls.

vaprak is an archfey, not an exarch of orcus. his closest ally is baba yaga, also an archfey.