Ragnarok

Hint: Unlimited continues:
Save and quit the game. Find the filenames "rag_save.000" and "sdata.000" (the first time you saved the game) and copy them to another folder. When your character perishes, exit the game, locate these files, and copy them back to the Ragnarok folder.
Information in this section was contributed by JM Arnisto.

Hint: Chaos: Artifact:
You need to have the Dimension Travel power and a grappling hook. Go to Chaos and drink a Potion Of Depredation. When you see an amulet or armor, place your pointer on it as a marker. Try to go near to that place and wait for the time until the armor or the amulet appears.
Information in this section was contributed by JM Arnisto.

Hint: Crypt: Artifact:
From ten meters underground, find the stairs leading down to twenty meters underground. Go down to the stairs and read a Scroll Of Cartography. You will see green stairs trapped in a wall. Dig to make a path and go down the stairs. When you enter a room and encounter some traps, the artifact is somewhere in that area.
Information in this section was contributed by JM Arnisto.

Hint: Slaeter's Sea: Artifact:
Read a Scroll Of Cartography and drink a Potion Of Depredation. When you see an amulet or armor, place your pointer on it as a marker. Go near the item and read a Scroll Of Lava Strike to get it.
Information in this section was contributed by JM Arnisto.

Hint: Wastelands: Artifact:
You need to have the Terraforming and Dimension Travel powers. Go to Wastelands and read a Scroll Of Cartography. Go near the volcano and terraform it into ground or another terrain to cancel its eruption. You can now find the artifact without haste.
Information in this section was contributed by JM Arnisto.

Hint: Defeating Gymir:
Go to Jotenheim and find Gymir's small castle. Terraform the door into water. Start attacking him by using throwing weapons. He is not affected by wands. Alternately, summon a magical being to kill him in one strike.
Information in this section was contributed by JM Arnisto.

Hint: Defeating Vidur:
Use a Wand Of Death at him. Be careful, because a Wand Of Death has a long range.
Information in this section was contributed by JM Arnisto.

Hint: Resistance to petrification:
Find a Wand Of Wishing, use it, and wish for a "Dead Hel Dragon". Eat this and you will have resistance to petrification.
Information in this section was contributed by JM Arnisto.

Hint: Permanently kill a Draugr:
These are many ways to stop a Draugr from returning back to life.
Information in this section was contributed by JM Arnisto.

Eat the dead Draugr.
Pick it up and use the Embalming skill.
Pick it up and read a Scroll Of Destruction.
Terraform the ground to water or quicksand.