Turmoil

Beta

Boosts
Unknown, most likely a negligble amount since you can barely notice any DPS increase.

Limitations
Turmoil's primary limitations are its high Prayer requirement, that it cannot be used alongside any Sap Curses or Leech Curses, and that its usefulness is limited against opponents that do not use melee. Because some monsters only use Magic and/or Ranged, they are treated as having Attack and Strength levels of 1. Therefore, Turmoil will not offer its additional boost to Attack and Strength against such opponents, although Defence will receive its boost as normal. Some examples of popular monsters that do not use melee are aquanites, waterfiends, spiritual mages, aberrant spectres, Dagannoth Supreme, Dagannoth Prime, and the Phoenix.

Turmoil and Piety
Turmoil is noteworthy for being the "strongest" prayer in the game in terms of melee boosts. It is comparable to Piety, although the two differ in a number of ways. Piety requires completion of the Knight Waves Training Grounds activity, 70 prayer and 70 Defence. Turmoil requires completion of The Temple at Senntisten, and 95 prayer. Piety is a prayer, and Turmoil is a curse. As such, you can not access useful curses while using Piety, nor useful prayers while using Turmoil. Piety's bonuses are constant and independent of the user's opponents in combat, if any. Piety also gives a higher base bonus to Attack and Defence. As such, Piety is ideal for offensive prayer flashing. After at least one hit with Turmoil active, the user will gain an additional boost of approximately 15% of the opponent's Attack/Defence level, and 10% of the opponent's Strength level, which usually results in stronger bonuses than Piety (this depends on the user's and opponent's levels). Additionally, Turmoil's drain rate (10 point per 2 seconds) is one-third slower than Piety's (10 point per 1.5 seconds). This makes Turmoil ideal for fast paced combat against high level opponents.

Advantages of Piety are: Advantages of Turmoil are:
 * Much easier to get.
 * More effective for prayer flashing.
 * Allows use of other prayers.
 * More powerful against higher level opponents.
 * Slower Prayer point drain.
 * Allows use of other curses.

Trivia

 * Switching from Ancient Curses to normal prayers on the White Knights' Castle altar, while using Turmoil, is an elite Falador task.
 * The only known NPCs to use Turmoil in combat are Nex, the leader of Zaros' forces in the God Wars Dungeon, and Kal'Ger the Warmonger, a Dungeoneering boss.
 * According to the ancient hymnal, Turmoil's verbal incantation is "Vim inimici mihi bono inclina." (Turn the power of my enemy to my benefit.)