Blessed blades (required 16): (Passive) Any weapon you wield or unarmed attacks are treated as having your alignement for damage reduction bypass purpose. (no effect if true neutral)

To unlock a destiny, you'll need to level up an adjacent destiny to a sufficient level. This "sufficient level" depend if the adjacent destiny is in the same sphere or not:
Unlocking an adjacent destiny in the same sphere require you to level up your destiny up to level 3
Unlocking an adjacent destiny in another sphere require you to level up your destiny up to level 4

So for example if you are currently in the exalted angel tree and want to unlock Legendary Dreadnough you'll need:
To level up exalted angel to 3 to unlock Unyielding sentinel (they are in the same sphere)
To level up Unyielding sentinel to 4 to unlock Grandmaster of flowers (they are in different spheres)
To level up Grandmaster of flowers to 3 to unlock legendary dreadnought

Destinies progress is not affected by reincarnation (of any kind).
That means if you are currently a FvS 25 with level 5 exalted angel, and you TR into a fighter, you'll still be a level 5 exalted angel.
However you'll be locked out from using destiny abilities (active and passive) until you level back to 20.

Spell Power

The spell damage amplification system (including bonuses from items and enhancements) now uses a Spell Power rating to determine how much damage you deal with spells. In most cases, each point of Spell Power increases the base damage of your spell by 1%. (For example, casting a spell with 100 Spell Power will result in double damage.)
Unlike the old damage amplification effects, Spell Power is not restricted by spell level, and bonuses to Spell Power of different types stack, following standard D&D stacking rules. (An Enhancement bonus and an Alchemical bonus will stack, but only the greater of two Enhancement bonuses will apply.) The bonus damage from Spell Power is not multiplied by metamagics such as Empower Spell or Maximize Spell.
Items and enhancements that granted damage amplification to specific damage types will now provide a bonus to Spell Power with spells of that damage type. (For example, an old Combustion V item that used to grant +20% damage to level V or lower Fire spells will now grant a +48 Equipment bonus to Spell Power when casting any Fire spell.) Potency effects grant Spell Power with any spell, as expected, but generally have lower values than specific effects.
Sources of Spell Power include:
Enhancements:
Enhancements such as Flame Manipulation or Pale Master now grant Spell Power to the appropriate spells equal to twice their old percentage values.
Items:
Items with old permanent damage amplification effects now grant an Equipment bonus to Spell Power.
Any weapon that has a Spell Power bonus also grants an Implement bonus equal to 3 times the enchantment bonus of the weapon. A +5 weapon will therefore grant a +15 Implement bonus to Spell Power with all spells. Any effect that increases the enchantment bonus of the weapon (such as an Artificer’s Enchant Weapon) will also increase the Implement bonus.
Any item with old temporary damage amplification effects now grant an Alchemical bonus to Spell Power when used (an Inferno item will now stack with a Combustion item).
The Xachosian Eardweller now grants a +25 Psionic bonus to Spell Power with all spells (it now stacks with all other effects instead of temporarily replacing them).