Defender of Varrock/Quick guide

Tracking

 * Talk to Captain Rovin in Varrock Palace, northwest tower second floor. (Chat options 1-1)
 * Enter the graveyard then talk to Hartwin.
 * Follow the footprints near the graveyard entrace, searching bushes, trees, stumps, mushrooms, and bones.
 * The trail eventually leads to Simon near the Chaos Temple.
 * Run south to the trapdoor, unlock it and climb down.

Undead army
If you don't have a Blurite ore, now is your opportunity time to mine one
 * Run north and look over the balcony.
 * Run west and take 3 bottles.
 * Kill 3 Armoured zombies, filling your 3 bottles with red mist.
 * Proceed deeper into the cave and through the door.
 * Run north and refill your bottles.
 * Go through the next door and peer over another balcony.
 * Return to Captain Rovin.
 * Talk to Thurgo, south of Port sarim. (Chat option 3)
 * Climb Ice Mountain, north of Falador.
 * Dig the snow 2 steps east of the White tree.
 * Excavate the snow and climb down.
 * Talk to Ramarno. (Chat option 4)
 * Use the Blurite on the forge.
 * Talk to Ramarno again.

Zombie invasion

 * Return to Captain Rovin, ignore the zombies.
 * Talk to Reldo in the library downstairs. (Chat option 1)
 * Read the Varrock Census on the lectern.
 * Search the scrolls on the floor a few steps south.
 * Read the List of Elders scroll.

Shield of Arrav

 * Talk to the following NPCs until one says that they are not a blood descendant:
 * King Roald
 * Aeonisig Raispher, next to King Roald
 * Sir Prysin, in a room west of the King
 * Curator Haig Halen, in the museum
 * Horvik the smith northeast of Varrock's fountain
 * Talk to Dimintheis in southeast Varrock where you started Family Crest.
 * Talk to Captain Rovin.
 * Quest complete!