[Skills help] third attack fourth attack

Automatic

Third attack allows a chance for an additional attack each round.  For
those who also have the skill of second attack, this improves the chance of
success for that skill as well.  Fourth attack works in the same way,
and improves the chances of both second and third attack.  Even having
perfected third or fourth attack does not guarantee three or four attacks in
every round as this depends largely on weapon speed.  These skills apply not
only to melee weapons, but also to ranged and thrown weapons.

See also: second attack