Vyre corpse

A Vyre corpse is the body of a slain Vyrewatch, Vyrelord, or Vyrelady. These monsters can only be killed with blisterwood weapons or the Ivandis flail. The player character notes that the corpse feels and weighs like wood.

Columbarium Cremation
During and after the Legacy of Seergaze quest, Vyre corpses can be cremated with teak or better pyre logs in the Columbarium below the Paterdomus. One corpse must be cremated during the Legacy of Seergaze quest. When a corpse is cremated, a Spectral vyrewatch will rise from the pyre, and the player will receive 79 prayer experience (+50% if wearing Morytania legs 4) and firemaking experience based on what type of pyre log was used. Wearing a Ring of fire or Flame gloves does affect firemaking experience. The higher the logs used, the higher the xp returned; higher logs do not increase chances of obtaining higher rewards.

Cremating vyre corpses after the quest allows the player to acquire Columbarium keys which unlock wooden alcoves in the Columbarium. These alcoves contain rewards, including some that are otherwise only obtainable through Treasure Trails.

The spectral vyrewatch does not attack you, it merely appears briefly then leaves, dropping a key on the pedestal near the cremation table.

A vyre corpse is cremated by first placing the pyre log on one of the pyre platforms, then placing a corpse on the log, and finally using a tinderbox to light the pyre. Only one corpse can be prepared for cremation at a time. A player who starts preparing one cremation (even if just placing the pyre logs) and then attempts to prepare a second is told that only one cremation may be 'administered' at a time. However, a new cremation can be set up as soon as the previous one is lit, even before the Spectral vyrewatch appears. A quick way to cremate several corpses is thus: This process can be further sped up by not collecting the Columbarium keys until you've cremated a full load of corpses. However, they will disappear if left upon the columns for too long, so waiting to collect the keys may not be a good idea if using a beast of burden to bring extra pyre logs. A good way to not lose any keys and still cremate at a decent speed with a War tortoise beast of burden is to light all logs in your inventory, withdraw your burden once, use up all but one log then pick up the keys and continue until no logs are left. With this method you do about half at a time and can collect all keys without them dissapearing on you. If using a War tortoise and you try to do them all without picking up the keys, you will lose 4-5 keys.
 * 1) Set up logs and a corpse on one pyre.
 * 2) Light the waiting pyre.
 * 3) As soon as the pyre is lit, set up logs and a corpse on an adjacent pyre.
 * 4) By the time Step 3 is done, the Spectral vyrewatch will have been released and Columbarium key will have appeared. Take the key.
 * 5) Repeat Steps 2-4 until all corpses are cremated.

Note: Though some people say wearing a ring of wealth helps with the rewards, there is no mention of the ring shining in the chatbox.

In addition to the rewards that can be obtained via the Columbarium keys, for every 50 vyre corpses that are cremated the player becomes more 'experienced' with the Ivandis flail, Blisterwood staff, Blisterwood polearm and Blisterwood stake. The Ivandis flail receives an invisible Attack, Strength, Defence bonus and the Blisterwood weapons receive Damage bonus against Vyrewatch. After cremating 500 corpses, the player receives the maximum possible boost for the flail, with +50 to Attack, Strength, and Defence; and the maximum possible boost for the Blisterwood weapons, with +100 to Damage. Achieving the maximum boosts for the Ivandis Flail and the Blisterwood weapons is a requirement for trimming the Completionist Cape.

You can check your progress at the southern end of the columbarium, by searching the lectern. It reveals that there is a list of names, subsequently, the amount of corpses that a player has cremated is the same as the amount of names crossed off the list. It should be noted there is no limit to how many corpses you can burn but only the first 500 give bonuses to your vampyre harming weapons.

You can also check more easily by right clicking the flail and selecting "check." It will tell you the exact number of corpses you have cremated.

Charms
Note: charms are a second reward, obtained with other items

Trivia

 * As of the Temple Trek update on 17 August 2011, Vyrewatch drop up to 17 different corpses with each one having their own stack in a bank. The dropped corpse does not depend on the level of the Vyrewatch killed. Despite this, all of the Vyrewatch in the Temple Trekking and Burgh de Rott Ramble activities drop the same type of corpse, distinct from the types dropped in Burgh de Rott and Meiyerditch. The type of corpse did not affect the rewards for cremation as they all gave identical Columbarium keys which stacked in a single pile when banked.
 * This was changed in an update on 17 June 2013, which made it so each variant of Vyre corpse would change to a single corpse type when picked up (rather than the previous 17) so they stack in a single pile in the bank. Any other corpse variants stored in the bank before the update would also change to the single type when dropped and picked up again.
 * However, in some rare cases, a second type of vyre corpse can exist. It is not known if these corpses can be obtained, or were only created during the update. In any case, removing them from the bank and putting it back in will not change the corpse to the normal kind.
 * The reference to the Vyre corpse weighing the same as wood is likely a reference to Monty Python and the Holy Grail, in which witches, being burned at the stake, were reasoned by Sir Bedivere to be thusly made of wood. Furthermore, in the same sketch, the sole purpose of witches was said to be for burning, and the sole purpose of Vyre corpses in RuneScape is for burning.
 * When dropped, Vyre corpses take up more than a single tile on the ground.

Vyre corpse