Sacred 2:Acute Mind

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Briefly increases the regeneration rate of all combat arts and adds a bonus to intelligence.

Aspect

See also: Sacred 2:Combat Art Modifications

Bronze

Proficiency - Decreases the regeneration time (Note: actually the cooldown) of Acute Mind. (49.5% + 0.5% per CA level decrease)
Insight - Additionally increases intelligence. (5 + 7.5 per CA level increase (?))

Silver

Defiant - Decreases the impairments and wounds. (20% + 0.5% per CA level)
Insight - Additionally increases intelligence. (5 + 7.5 per CA level increase (?))

Gold

Celerity - Increases attack and cast speed. (20% increase)
Easiness - Additionally decreases the regeneration time. (15% + 0.5% per CA level / 50.8% on CA level 1, 72.8% on CA level 50, 81.25% on CA level 100, ... linear increase of base value)

The following skills will affect this combat art:

Concentration: Reduces regeneration time.
Nature Weaver Focus: Increases CA level without penalty. Reduces regeneration time.
Nature Weaver Lore: Increases cast speed and amount of Intelligence the Combat Art raises.
Combat Discipline: Reduces regeneration time while in a combo.

Casting Acute Mind will reduce its own Regeneration Time (Does not effect Cooldown time), so later in the characters development if setup for the best Regeneration times keeping the Spell up semi-permanently will ensure a constant low regen time.
Even without the Insight mods, this CA will cause a large increase in damage of any activity calculated with the intelligence value. (non-weapon-based CAs, magic staffs).
Taking the Proficiency bronze mod will cause Acute Mind's cooldown (not the regeneration!) to decrease with additional runes. This will allow the duration of the skill to eventually catch up with the total regeneration time, allowing the skill to remain up semi-permanently. This does not occur until later in a character's development, approximately level 100.
Useful for speeding up regeneration of Twisted Torment for shrunken head hunting.

Pros

VERY high related damage increase via higher Intelligence for Combat Arts and magic staffs.
Seems to increase damage of shurikens (glitch? consoles only?)

Cons