Tier 1
Snow Cave: A pain in the ass because you're dealing with extreme cold & level 200-300+ wolves, yetis and bats. You can't get much more than a swarm of dimorphs in to help you.
Tier 2
The Caverns of Lost Hope: Requires a really strong water tame. Full of mosas and squids to wreck your day.
Swamp Cave: Requires very specific gear (scuba/ghillie combo and a high level frog). With this gear it's possible. Without it, it's a nightmare of high level scorpions, spiders, meganeura swarms, and poison damage over time.
Upper South Cave: ??
Tier 3
South East Cave: High Temperatures, easy to get lost, lava pits, and standard cave enemies. Bring some grappling hooks for safety, good weapons, and a way to deal with the heat.
North East Cave: Lot of bats and ledges. Very easy to fall to your death here. Grappling hooks and parachutes simplify it a lot.
Caverns of Lost Faith: Not exceptionally challenging (Can be done on a high level megalodon), but really requires a water dino to be safe. Jellyfish are the real danger in here.
Tier 4
Central Cave: Pretty basic and straight forward cave crawl with standard cave mobs. Just watch out for arthrolopluera who will destroy your armor with their spit and can hit you even on a mount.
Lower South Cave: Same as above.
North West Cave: The only real threats here are not paying attention and falling to your death and getting lost. There are a few bats and spiders. Bring some grappling hooks and be prepared to kill some bugs to make it a cake walk, but the hooks aren't required. It's possible to get the artifact without ever going over a gap.
Snow Cave: A pain in the ass because you're dealing with extreme cold & level 200-300+ wolves, yetis and bats. You can't get much more than a swarm of dimorphs in to help you.
Tier 2
The Caverns of Lost Hope: Requires a really strong water tame. Full of mosas and squids to wreck your day.
Swamp Cave: Requires very specific gear (scuba/ghillie combo and a high level frog). With this gear it's possible. Without it, it's a nightmare of high level scorpions, spiders, meganeura swarms, and poison damage over time.
Upper South Cave: ??
Tier 3
South East Cave: High Temperatures, easy to get lost, lava pits, and standard cave enemies. Bring some grappling hooks for safety, good weapons, and a way to deal with the heat.
North East Cave: Lot of bats and ledges. Very easy to fall to your death here. Grappling hooks and parachutes simplify it a lot.
Caverns of Lost Faith: Not exceptionally challenging (Can be done on a high level megalodon), but really requires a water dino to be safe. Jellyfish are the real danger in here.
Tier 4
Central Cave: Pretty basic and straight forward cave crawl with standard cave mobs. Just watch out for arthrolopluera who will destroy your armor with their spit and can hit you even on a mount.
Lower South Cave: Same as above.
North West Cave: The only real threats here are not paying attention and falling to your death and getting lost. There are a few bats and spiders. Bring some grappling hooks and be prepared to kill some bugs to make it a cake walk, but the hooks aren't required. It's possible to get the artifact without ever going over a gap.