Dahmaroc

Dahmaroc was a mighty mage in the Second Age. Back then, runes were in short supply as the only ones were the ones Guthix created. It is said he was cursed and turned into stone while fighting for more runes. According to the archaeologists of the Varrock Museum, he was doomed to spend all eternity with the thing he loved most.

His statue eroded and broke down into many Strange rocks that spread across Gielinor (Shattered Heart Distractions and Diversions). Thousands of years later, in the Fifth Age, many adventurers discovered the pieces and brought them to the Varrock Museum for experience on the skill that was being trained when the pieces were found. When the piece of rock found is examined, it says something along the lines of "A rock found while (varying per skill)". You must use two rocks from each skill ( Agility, Cooking, Construction, Crafting, Farming, Fletching, Fishing, Firemaking, Herblore, Hunting, Mining, Runecrafting, Smithing, Thieving, and Woodcutting ) in order to finish the statue. Once it is completed, a short cutscene plays and the statue shatters. The archaeologists will say they studied the statue as you had been building it and were able to make a replica of one of the statue's pieces for you. They also say you could use the pieces to make your own statue at the Study in your house. You must complete the statue 30 times to get the full reward. The statue can only be completed once a week also. 30 statues will take about 900 stones to complete.

For certain skills there is more than one way to obtain the stones.

Agility : Completion of the following courses:
 * Tree Gnome Stronghold course (basic or advanced).
 * Agility Pyramid course.
 * Barbarian Outpost course (basic or advanced).
 * Ape Atoll course.
 * Wilderness course.
 * Werewolf course.
 * Bandos' Throne Room course.
 * Dorgesh-Kaan course.
 * Brimhaven Agility Arena (one chance per 10 tickets)

Cooking : Cooking fish.

Construction : Visiting your house for at least a minute while not in build mode.

Crafting : Making gold jewellery; making items from leather or dragonhide.

Farming : Harvesting vegetables, hops, herbs or flowers.

Fletching : Making unstrung bows or crossbow stocks.

Fishing : Fishing with any net or cage.

Firemaking : Lighting a fire using any logs and a tinderbox.

Herblore : Cleaning herbs; Combining unfinished potions with secondary ingredients, not including barbarian mixes.

Hunter : Tracking; checking box and deadfall traps; practising falconry.

Mining : Mining ore, coal, clay, pure essence or stone.

Runecrafting : Crafting runes.

Smithing : Smelting normal ores; smithing items from normal ores.

Thieving : Picking pockets.

Woodcutting : Cutting any wood or ivy; training at the sawmill.

The "Shattered Heart" newsletter says little about Dahmaroc. All it says is: "You can also learn something of Dahmaroc, a Second Age mage who was cursed in a battle over the limited supply of runes in those dark times. With diligent study, this could lead to another reward, this one of more solid and permanent construction..." Dahmaroc

Trivia.

 * Dahmaroc's stance is similar to that adopted by Saradomin on many statues.
 * Oddly, you can get a Strange rock from Runecrafting. However, runecrafting was discovered in 4th age, and he was from the 2nd age. This may be a mistake, or he knew about it, but his knowing about it seems unlikely, as he was killed fighting for more runes.