As mentioned in the Mana entry, Mana is not evenly distributed throughout a Creation's body — the hands, for instance, contain the most, as they are constantly used for casting spells. However, some psionic magic requires direct manipulation through the brain, so mages' brains generally contain relatively more Mana. This facilitates casting such magic, but also makes it possible for other mages to manipulate this Mana and thereby control others' minds or even their behavior. Over the long course of evolution, Creations developed a mechanism to counter this threat: Mechania.

Biologically speaking, Mechania refers to the soft tissue on the inner side of the skull. This tissue is generally more developed in mages. It blocks foreign Mana from passing through — "foreign" meaning the Voiceprint does not match the individual (see Mana) — making mental manipulation considerably more challenging.

Mechania can be actively practiced and strengthened, and is also an important topic in Psychic Defense.

Sorcerers lack this structure, and Mechania also cannot prevent Sorcerers from manipulating others' minds, because Sorcerers have no Voiceprint (again, see Mana). This likewise makes it almost impossible to manipulate a Sorcerer's mind.

正如魔力 词条中所提到的，魔力在造物的体内分布并不均匀，例如双手最多，因为他们经常被用来施展魔法。

然而，有一些精神类的魔法需要直接通过大脑操控，因此魔法师的大脑中一般也有相对更多的魔力。这为施展这些魔法提供了便利，然而也值得其他魔法师操纵这些魔力进而操控他人的心智甚至行为成为可能。在漫长的进化中，造物进化出了一种应对这种威胁的机制：心智屏障。

生物上来说，心智屏障指的是颅骨内侧的软组织，一般来说魔法师的这些组织更加发达。这些组织会阻止异质魔力通过（异质指声纹与本人不匹配，见魔力 ），这使得操纵他人的心智更加具有挑战性。

心智屏障是可以被主动练习，强化的，这也是精神防御术的重要讨论话题。

魔法使缺乏这种结构，并且这种结构也不能对魔法使操控他人心智造成阻碍，因为魔法使没有声纹（依旧见魔力 ）。这也使得操控魔法使的心智几乎不可能。