Diminished Spellcasting

A mystic dervish may cast one fewer spell of each level than normal. If this reduces the number to 0, he may cast spells of that level only if his Intelligence allows bonus spells of that level.

Arcane Pool (Su)

A mystic dervish can enhance two weapons with his arcane pool, rather than just one. He must pay separately for each and must take a swift action to enhance each one individually.

This ability modifies arcane pool.

Two-Weapon Casting (Ex)

At 1st level, a mystic dervish gains Two-Weapon Fighting as a bonus feat, even if he does not meet the prerequisites. A mystic dervish can cast magus spells while wielding a weapon in each hand, using the hands holding his weapons to complete the somatic components of his spells.

This ability replaces spell combat.

Twinned Spellstrike (Su)

This ability functions like spellstrike, but the mystic dervish can use it when wielding two weapons. The spell is delivered through whichever of his two weapons strikes first.

This ability alters spellstrike.

Dervish Defense (Ex)

At 7th level, a mystic dervish gains a +1 shield bonus to AC when wielding two weapons. This bonus increases to +3 at 13th level. The shield bonus stacks with the bonus provided by the Two-Weapon Defense feat.

This ability replaces medium armor and heavy armor.

Twinned Spell Combat (Ex)

At 8th level, a mystic dervish learns to cast spells and wield two weapons at the same time. This functions as the spell combat ability, but works only when the mystic dervish is wielding a weapon in each hand. He can use all attacks gained from wielding two weapons while using twinned spell combat. The mystic dervish is considered to have a free hand to cast spells when using this ability. The penalty to attack rolls for fighting with two weapons and for using spell combat stacks. 

This ability replaces Improved Spell Combat and Greater Spell Combat.

Spell Flurry (Ex)

At 20th level, when a mystic dervish uses twinned spell combat, he no longer takes the -2 penalty to attack rolls that spell combat normally imposes (he still takes the penalty for using two weapons, unless he has another ability to reduce it). If he casts his spell before making any weapon attacks, he gains a +2 insight bonus on his attack rolls until the end of his turn. If he makes his attacks before casting the spell, he gains a +1 insight bonus on his caster level check to overcome the spell resistance of his target for each weapon attack that he struck the target with that turn.

This ability replaces true magus.

Magus Arcana: The following magus arcana complement the mystic dervish archetype: accurate strikes, arcane accuracy, critical strike, hasted assault, and prescient attack.