Hellhound

Hellhounds are mid-to-high level demons, often given as a Slayer assignment to mid-to-high level players. Hellhounds are an excellent source of hard clue scrolls, as they drop them more frequently than other monsters.

Strategy
As their combat level suggests, hellhounds are not easy to defeat. It's worth noting, however, that their high combat level is mostly reflective of their accurate and powerful attacks; hellhounds have low defensive stats. Players with a low Defence level should bring the best armour that they can afford as well as high healing food.

As they only attack with Melee, the Protect from Melee prayer can be used to nullify their attacks. The most effective yet afkable way to use this strategy is at the Catacombs of Kourend, as the area is a multi-combat zone. Players who have completed at least easy tasks of the Ardougne Diary can teleport to Kandarin Monastery to recharge Prayer points, and teleport back via Xeric's talisman's Xeric's Heart option (requires full completion of Architectural Alliance) or the Teleport to Kourend spell (requires 69 Magic and reading Transportation incantations to unlock the spell). Bring prayer-boosting armour such as the Proselyte armour for longer trips and some food just in case you run out of Prayer points and get hit by the hellhounds. Additionally, having a bonecrusher in your inventory is beneficial as burying bones inside the Catacombs of Great Kourend also restores Prayer points.

Prayer "flicking" can dramatically reduce the cost of fighting them; however, this requires close attention and probably some food to correct mistakes. Since they occupy a large space of 2-by-2 squares, hellhounds can easily be safe-spotted in Taverley Dungeon on rocks and columns.

Players hunting hard clue scrolls can kill hellhounds located east of the Deserted Keep while wearing a ring of wealth (i). This doubles the drop rate of clue scrolls from hellhounds, from 1/64 to 1/32.

Even though they're classed as demonic, the Arclight does not work against them.

If a Slayer master is checking your combat level, you are required to have at least level 75.

Locations

 * Taverley Dungeon (can be safe-spotted easily behind the '+' rocks)
 * Witchaven Dungeon (a short puzzle is required to enter the area with hellhounds)
 * God Wars Dungeon (level 127, NOT found in Wilderness God Wars Dungeon)
 * Stronghold Slayer Cave
 * Catacombs of Kourend
 * Wilderness:
 * Revenant Caves (level 136)
 * Level 50 Wilderness (south of Resource Area)
 * Level 54 Wilderness (north-east of Deserted Keep)

100%

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Other

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Trivia

 * Though they are demons, Hellhounds drop bones instead of ashes like a regular demon would.