Complex Hero's Hero Complex (Isaac's Compendium)

—Strength Name: Iron Will
—Description: Isaac gets excited about facing new challenges and experiences in his life. Intimidating odds only makes him want to try harder. As such, he gets double points in Courage.

—Strength Name: Battle Instincts
—Description: Demon powers or no, Isaac hones his fighting skills everyday, so he can be ready at a moment's notice. His reflexes are keen and he receives a 10% boost to Luck.

—Strength Name: Defensive Broad Sword
—Description: In PvP combat, Isaac is adept at using his sword for defense. When used to Parry in Human v Human combat, Isaac's Attack receives a 10% Dex boost.

—Strength Name: Combat Training
—Description: Isaac's combat training Honed his mind and muscles together, and while he is not a paragon of mortal strength, he is an agile and capable fighter. His Dexterity receives a 10% boost.

—Weakness Name: I Don't Have Time for This!
—Description: Time is precious, and there are so many ways it can be spent! Isaac's mind is always churning, and he often finds himself missing details he should have caught, and having to retrace his steps. When engaging in activities that raise his Intelligence or Understand, there is a 50% chance he will receive half as many points.

—Weakness Name: Heavy Sword
—Description: In PvP combat, When engaging in attacks with his weapon, He can hit no more than twice with his sword. Other versions of the weapon created by Soul Skills may over-ride this weakness.

—Weakness Name: Unsteady Aim
—Description: Isaac has been trained as a physical fighter. He knows how to used Firearms, of course, but he prefers to fight up close. When making firearm attacks, Isaac's accuracy is reduced by 10%.

—Weakness Name: Magic is Cheating
—Description: Even in videogames, Isaac doesn't like those that stand at a distance and launch magical attacks. He himself dislikes using such tactics, and doesn't hone the skills required to do so. His Pmstr is reduced by 10%.

The Grigori Seal actually has three personalities, three "Demons" whose essence was bound together to create the weapon.
Samyaza, a crisp and calm voice of insight...if a little opinionated, sometimes to the point of bigotry.
Azazel, An honest and encouraging voice who...may get just a little to interested in the lives of those around Isaac.
Gadreel, A strong voice, who gives fantastic battle advice. Especially in social situations where slaying your enemies is the best way to get them to shut up about baseball.

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The Grigori were angels who fell from heaven after the birth of man. They were scorned by god and fell to the earth, their wings discarded. Whether or not the spirits who were bound in this weapon are actual Grigori or Demons similar to them, anyone could say.

Appearance while in Last Life: Isaac's body does not change in Last Life, but the sword, Grigori Seal, takes on a more elegant, slender appearance.

Spoiler:

Description: When the Isaac's health gets lower than 30% he automatically goes into a powerful state called [Last Life]. This happens once per battle and powers all his moves up by 30%. Even his skills rank up a tier in damage. This mode lasts for three turns regardless if his HP recovers past the 30% mark.

Soul Skill Name: Azazel's Twin Swords
Persona Name: Grigori Seal
Tier: Tier 1
Cost: 8 SP
Type of Damage: Buff
Description: When this buff activates, the Grigori Seal splits into two thinner weapons. These two weapons are still one weapon, and follow the rules as one weapon, except as follows. This effect lasts for three turns.
PvS: While wielding Azazel's Twin Swords in PvS combat, Isaac can make two dex attacks with his weapon during his turn.
PvP: while wielding Azazel's Twin Swords in PvP combat, Isaac moves faster, and can attack 4 times in a turn.

Soul Skill Name: Sentinel
Persona: Grigori Seal
Tier: Tier 3
Cost: 30 SP
Type: Buff
Description: Isaac Guards for the next three turns and cannot attack. Each turn guarding, Isaac becomes the target of any attack made by a chosen enemy (the target of this effect can not change during its duration). While guarding as a result of this skill, Isaac's normal 50% damage reduction increases to 60%, and he regains HP instead of SP each turn as a result of guarding. If the enemy chosen when this skill is used dies or is otherwise removed from the fight, this skill's duration immediately ends, but Isaac can not end this effect while the target is still alive. Isaac's turn takes place at the end of initiative order while under this effect. [Effect has two turn Cooldown]

In PvP when this skill is used, Isaac is able to use his sword attacks to clash Persona skills for three turns.