Stoning a weapon
Assuming you follow my advice and use either a blunt or a two-handed weapon, here is basically what stone you should put in your weapon:

Elemental stones add elemental damage. Seems obvious, but there’s a difference between damage and attack. When putting elemental stones, always put the same element and same level of stone in one weapon. The element “activates” based on the type and level. For example if you put one earth stone and one water stone, on one attack you’ll get 3 earth damage, on the other 3 water damage. Now if you put 2 water stones, you will always get 2*3=6 water damage. Berserkers have no elemental bonus in their skills, so it doesn’t matter what element you use.

Attack prayer stones add to Basic Attack. What’s the difference with damage? Well, your damage is calculated based on your Basic attack. For example, a combat skill that gives 100% basic attack bonus will deal a damage of BA+BA*100% (BA = Basic attack of course). Attack prayer stones are a must at higher levels when your skill bonuses are big (around 200%). At low levels, it is maybe better to put elemental stones.

Cold prayer stone: this is a good compromise between price and effect. You can combine a cold stone with elemental stones of attack prayer stones. It gives +6 to +8 damage, with a small chance to slow the target on normal hits. We don’t care about the slow possibility, but +6 for a level 1 stone is a nice additional damage. You would need a lvl 3 elemental stone to achieve the same damage. At higher level, +8 for a lvl 3 is still nice damage, equal to an attack prayer stone in a 170% combat skill. Those stones are cheaper and maybe easier to put in than an attack archlord gold prayer stone, so it’s not a bad idea.

Electric prayer stone: same as Cold stone, with a chance of stunning on normal hits

Deadly Poison archlord gold prayer stone: crap, don’t use it

Accuracy stones: spare me the sight of an accuracy stone in a weapon please

Conclusion:
Best is : full of attack prayer stones
A bit cheaper : 1 cold stone, 1 electric stone, the rest being attack prayer stones
Cheapest option but still good : 1 cold stone, 1 electric stone, the rest being elemental stones of the same element and same level

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