Religion

The orcs and the humans have different views of the world. While they somewhat agree on reincarnation, they differ in for example deities. Orc faith does not contain any, while humans believe in the Weaver, the goddess of the world.

The Orcs' View
The world was born from fire and rock, and when the fire ceded the orcs were born from that rock. Then it rained, and the water mixed with the earth, forming mud and creating humans.

The orcs believe that when they die they disappear. They describe it like a sleep you never wake up from, unless your spirit is strong enough, then it can stay in the world. The spirit can then watch over its children and grandchildren, and if it is truly strong it'll be reborn again by battling a newborn spirit for its body.

They also reason that while the strong can protect the weak in life, every spirit has to fend for themselves in death.

The Humans' View
The humans see the world as a big tapestry, where the Weaver, the goddess of the world, weaves creation for everyone to live in.

When they die, you get to sit by the Weaver's side and watch the tapestry. There you can see your children and everything else in the whole world. Then, when you feel satisfied, she weaves them back in the weave and you are reborn.