Crowfall's gamespace is divided into multiple worlds that each encompass a different purpose or level of risk and reward. Currently there are three bands: the Eternal Kingdoms, God's Reach, and Campaigns.
Crowfall's answer to player housing, Eternal Kingdoms (EKs) are Unique worlds set up by a particular player that either be public or private. There are no Monsters or killable NPCs that spawn in Eternal Kingdoms. Only Poor quality basic harvestable resources can be acquired here (Knotwood, Cobblestone, and Slag).
The owner of the EK can enable PvP. In such a case, everyone can attack everyone else, though you may still form parties of up to 5 people. If you are killed in an EK your inventory is lootable, so be careful. Your account vault is accesible from anywhere inside an EK so make sure to store your stuff if you intend to PvP.
Besides free for all PvP, the primary purposes of the Eternal Kingdoms is to act as centers of Commerce. The owner (and players they allow) can place buildings, crafting stations, and vendors.
God's Reach is the starting point for most characters where you'll begin the New Player Experience; a tutorial that also quickly levels your character. The NPE will take you through a variety of zones with varying level ranges of mobs for you to level your character and learn the game's mechanics from level 1 to 17-18. There is no PvP in God's Reach proprer, everyone is on the Balance faction here.
Although these NPCs and Monsters don't pose a lot of threat, attract too many or find one that's too high level and you can still die, resulting in loss of durability on your equipment, but unlike the higher risk bands you do not drop your inventory in this band. Because of the low risk, the gear and other resources that drop off of these NPCs and Monsters are low quality.
You won't find rare NPC or Monster spawns in God's Reach.
Harvestable resources will only be between Rank 1 and 3. From these you will get mostly Common quality materials, some Uncommon quality, and very little Rare quality.
This world is setup as a practice faction campaign where the scores contantly reset. This means your inventory is still safe but you can now PvP with the opposing factions outside the faction temples. When you first enter the Infected, you will select a faction (Sun, Moon, or Earth). You can team up with others in your faction to roam, siege, and whatever other activities you desire.
As far as rewards go, there are some Captain and Chief ranked NPCs, as well as the occasional Elder animal monsters. These enemies drop higher quality gear and other resources, such as Necromancy additives. Additionally you will find Minor Thralls that drop Minor Disciplines.
The Harvestable Resources in the Infected range between Ranks 1 through 6. Harvesting these results in mostly Common quality, some Uncommon quality, and very little Rare quality resources.
In this World, your Guildmates or allies (up to 5 guilds) are your only friends. World PvP is enabled between Guilds and the Siege hours are taken very seriously. If you die in the Dregs, you lose your inventory, which can be picked up by other players. You keep your equipped armor, weapons, and tools.
Currently, campaigns last anywhere from a few days to several weeks, rotating through different seasons that affects the NPC spawns and your Harvesting ability.
This is the highest risk World, meaning you could potentially reap the best rewards. In addition to Captains and Chief NPCs, you will also find Kings and Heralds, who drop even better gear. In addition to Alphas animals you will also find Elders and Ancients, who will drop crafting belt items and the highest quality Necromancy additives.
Harvestable Resources in the Dregs are between Ranks 7 through 10. Harvesting these results in a good amount of Uncommon quality, fair amount of Rare quality, some Epic quality, and very little Legendary quality resources. You will NEED Advanced Tools to harvest these resources.
The Dregs also uses a unique secondary scoring system to Conquest called Divine Favor, every season has a set of cards in different categories and with different critera for guilds to compete and receive points. Whichever guilds have the most favor for these categories can win various prizes at the end of the campaign.