Blackguard follows the spells per day as shown in the table here:
http://www.d20srd.org/srd/prestigeClasses/blackguard.htm. A base wisdom score of 10 + the spell's level is required to cast a spell.
Assassin follows the spells per day as shown in the table here:
http://www.d20srd.org/srd/prestigeClasses/assassin.htm. A base intelligence score of 10 + the spell's level is required to cast a spell.
These replace the classes' previous spell-like abilities.
Blackguard Level 1- Corrupt Weapon
- Demonflesh
- Doom
- Cure Light Wounds
- Inflict Light Wounds
Blackguard Level 2- Bull's Strength
- Eagle's Splendor
- Darkness
- Cure Moderate Wounds
- Inflict Moderate Wounds
Blackguard Level 3- Contagion
- Blindness/Deafness
- Protection from Elements
- Cure Serious Wounds
- Inflict Serious Wounds
Blackguard Level 4- Poison
- Abyssal Might
- Freedom of Movement
- Cure Critical Wounds
- Inflict Critical Wounds
Assassin Level 1- True Strike
- Ghostly Visage
- Ultravision
- Knock
Assassin Level 2- Cat's Grace
- Fox's Cunning
- Darkness
- Invisibility
Assassin Level 3- Poison
- Spider Poison
- Deep Slumber
- Insight
Assassin Level 4- Heart Ripper
- Clairaudience/Clairvoyance
- Freedom of Movement
- Improved Invisibility
Corrupt WeaponSpell Level: Blackguard 1
Innate Level: 1
School: Transmutation
Descriptor: Negative Energy
Component: Verbal, Somatic
Range: Touch
Area of Effect / Target: Creature or Weapon
Duration: 1 Hour + 2 Turns / Level
Additional Counter Spells:
Save: None
Spell Resistance: No
The touched weapon gains a +1 enhancement bonus and deals an additional 1d4 points of negative energy damage on each successful attack.
DemonfleshSpell Level: Blackguard 1
Innate Level: 1
School: Transmutation
Descriptor:
Component: Verbal, Somatic
Range: Touch
Area of Effect / Target: Single
Duration: 1 Hour + 1 Turn / Level
Additional Counter Spells:
Save: None
Spell Resistance: No
The target's flesh becomes thick and leathery like a demon's. The target is granted a +1 bonus to natural armor, with an additional +1 for every four caster levels.
Abyssal MightSpell Level: Blackguard 4
Innate Level: 4
School: Conjuration
Descriptor:
Component: Verbal, Somatic
Range: Personal
Area of Effect / Target: Caster
Duration: 1 Hour + 1 Hour / Level
Additional Counter Spells:
Save: None
Spell Resistance: No
The caster summons evil energy from the Abyss and imbues himself with its might. The caster gains a +2 enhancement bonus to Strength, Constitution, and Dexterity. The caster's existing spell resistance improves by +2.
Heart RipperSpell Level: Assassin 4
Innate Level: 4
School: Necromancy
Descriptor:
Component: Verbal
Range: Short
Area of Effect / Target: Single Living Creature
Duration: Instant
Additional Counter Spells:
Save: Fortitude Negates
Spell Resistance: Yes
Target living creature must make a fortitude save or be slain. If the target has more hit dice than the caster, the target is instead stunned for 2d4 rounds. Similarly, if the target is immune to death effects, the spell will attempt to stun for 2d4 rounds.