A kensai spends his life focusing his training and meditation into a rapturous perfection of the use of a single weapon, which is usually but not always a sword, channeling his arcane might through it in a dizzying and deadly dance beyond the abilities of even the greatest of mundane warriors.
A kensai is proficient in simple weapons and in a single martial or exotic melee weapon of his choice. A kensai is not proficient with armor or shields and suffers normal arcane spell failure chance when casting magus spells while armored.
A kensai 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.
At 1st level, when a kensai is wielding his chosen weapon, he gains the canny defense ability. This is identical to the duelist prestige class ability of the same name, save that his chosen weapon may be of any type.
At 1st level, a kensai gains Weapon Focus with his chosen weapon as a bonus feat.
At 4th level, when a kensai hits with his chosen weapon, he can spend 1
point from his arcane pool in order to maximize his weapon damage. Don’t
roll for damage—the weapon deals maximum damage. This affects only the
weapon’s base damage dice, not additional damage from sneak attack, magical weapon properties, spellstrike, or critical hits. If the kensai confirms a critical hit,
he can instead spend 2 points from his arcane pool to increase his
weapon’s critical multiplier by 1.
This ability replaces spell recall.
Starting at 7th level, a kensai counts his magus level –3 as his fighter level for the purpose of qualifying for feats (if he has levels in fighter,
these levels stack), but forfeits the benefit of such feats with
weapons other than his favored weapon.
This ability replaces knowledge pool.
At 7th level, a kensai applies his Intelligence modifier as well as his Dexterity modifier on initiative rolls (minimum 0). A kensai may make attacks of opportunity when flat-footed, and may draw his favored weapon as a free action as part of taking an attack of opportunity.
This ability replaces the medium armor ability.
At 9th level, a kensai adds his Intelligence bonus (minimum 0) on critical hit
confirmation rolls with his favored weapon. In addition, the kensai may
use his magus levels in place of his base attack bonuses to qualify for
and any feat for which it is a prerequisite; these feats apply only
with a kensai’s favored weapon.
This ability replaces the magus arcana normally gained at 9th level.
This ability replaces improved spell recall.
At 13th level, a kensai may always act and may draw his weapon as a swift action during a surprise round, though he is considered flat-footed until he acts. During a surprise round or when attacking a flat-footed opponent, he adds his Intelligence modifier on damage with his chosen weapon (minimum 0).
This ability replaces heavy armor.
At 19th level, a kensai’s initiative roll is automatically a natural 20 and he is never surprised.
This ability replaces greater spell access.
This ability replaces true magus.