Kill the small zombie rat with the long tail, pick up the red key and use it on the north-west door, then go up the ladder.
Kill the thin hooded ghost with the patterned robe to receive the orange key, go through the door second from the north and climb the ladder.
Kill the skeleton with the small round shield and pick up the yellow key.Use the key on the south-west door and climb down until you get to the zombies.
Kill the zombies. One of them will drop a blue key. Make sure to open the BLUE door, NOT the exit door.
Travel down into the mysterious and damp Dwarven Mine. Find the room with a sealed door in the northeast part of the mines and use all the items on the "Magical Door".
The hidden room.Open the chest inside to find the second map piece.
Talk to the Guildmaster at the Champion's Guild.
Third Map Piece
A player obtaining the final map piece.
Items to bring: 10,000 Coins or 1 Law rune and 1 Air rune and a Ranged, Magic or a halberd weapon.
Killing Wormbrain and using Telekinetic Grab to get the map piece. Or
Talk to him and pay him 10,000 coins for the map piece.
Obtaining a Ship
Items to bring:2000 Coins, 90 steel nails, 3 regular wood planks, and a hammer
Talk to the Guildmaster and ask him about acquiring a ship.
Go to Port Sarim and buy a boat called Lady Lumbridge, for 2,000 coins from an NPC Klarense on the second dock from the Port Sarim jail.
Repair the damaged boat.
Go to Draynor Village and talk to Ned. (Remember to bring your map)
The Fight
Cabin Boy Jenkins being killed by Elvarg.
Items to bring: Anti-dragon shield, your best armour suited for your fighting style, your one-handed weapon, any potions you may need, runes/bolts , even if an anti-dragon shield is equipped and far more if it is not;teleport runes, rest of your inventory filled with food (lobsters or better).
Go to Draynor Village bank and withdraw your equipment for the fight.
Board your ship, and talk to Ned. Tell him you're ready to sail to Crandor Isle.
After crashing on the island shore, make your way across the island to the peak, run past the lesser demons at the top and take the stairs into the heart of the island.
Move past the skeletons until you see Elvarg behind a short wall of spikes protruding from the ground on the east.
Climb over it and begin the fight.
It is Strongly Recommended to read a detailed version on how to fight Elvarg here.
Conclusion
A player who has killed Elvarg.
Leave Crandor island by passing through secret door.