The stone is located in the volcanic tundra between Windhelm and Riften, just outside the mountain range between the two locations. Near the Eldergleam Sanctuary and Darkwater Crossing, the stone is by the river to the southeast.
The magicka regeneration decrease may appear to be a disadvantage at first, but when combined with the Recovery perks, the drawbacks can be negated, with the added benefit of an extra 50 magicka points and 50% spell absorption.
When combined with the Magic Resistance and the Atronach perks from Alteration and the Elemental Protection perk from Block, it is possible to build a character that is highly resilient to magic. These advantages are more prominent on races with a greater magical aptitude. As an example, the Bretons, who possess the Dragonskin power, can stack this with the Atronach Stone, making the player immune to magic for the duration of Dragonskin. As for an Altmer, the player can counter the reduced magicka regeneration by engaging their Highborn power or by using equipment with the Regenerate Magicka enchantment, such as the Morokei mask. It is also possible to possess 170 points of extra magicka for the Altmer if they elect to use this stone, owing to their initial magicka pool being higher than other races, combined with the Miraak mask.
Also given the way the magic regeneration system works, with the more magicka a character has, the more they gain per second. So with a 50% reduction to magic regeneration, the two ways to counteract this effect is to either get another 50% regeneration effect OR double the magicka capacity.
For another, slightly unorthodox, strategy, this stone can be used by a pure combat character who does not use spells. The slight stunt in magicka regeneration is rendered irrelevant, while gaining powerful Spell Absorption. The magicka boost, however, is similarly disregarded.
This section contains bugs related to The Atronach Stone (Skyrim). Before adding a bug to this list, consider the following:
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PC 360 PS3 The game treats summoning as a spell being cast on yourself, thus the 50% spell absorption chance kicks in making summons 50% likely to not occur.
PC 360 PS3 When a summoning spell gets negated the player will "absorb" the magicka, this can be used to restore a low magicka level. However, since 50% of the time the spell still works normally, it can take a few tries and you also must have enough magicka to actually perform the spell.
360 When using the Dragon ShoutSummon Durnehviir, should it fail the player will regenerate all their magicka, due to the game treating the Shout as a Conjuration Spell.
PC 360 PS3 The 'absorb' animation used for showing that an enemy's spell is being absorbed can also play incorrectly for non-magical attacks. This has been observed with everything from non-enchanted swords to a wolf's bite. The reason this occurs is because wolf/bear attacks have a chance to inflict a disease such as Rockjoint, so their attacks have a magical component (each time the animal attacks it casts a spell on you with a small chance to inflict a disease). Thus, the Atronach Stone reduces the chance for you to receive a disease from these animals by 50%.
In some instances, the 50% spell absorption also interferes with the Elemental Wall spells (Flames, Frost, and Storms). When casting the Wall spell, the wall appears sporadically, and often not at all.
The spell absorption effect may cause problems during Brelyna's Practice. In the quest a spell is cast on the Dragonborn, however if the spell is absorbed then the quest will not progress any further.
A potential solution for the spell absorption interference is to place the Atronach Stone on the Aetherial Crown, so that the Stone's effects can be equipped and unequipped as needed.