Improving the assassin

[onivel]

Here is the class as implemented... several of the requested spells are already given in a 1/day format.

Assassin

The assassin is a master of dealing quick, lethal blows. Assassins often function as spies, informants, killers for hire, or agents of vengeance. Their skill in a variety of dark arts allows them to carry out missions of death with shocking, terrifying precision. Rogues, monks and bards are ideal candidates to become assassins.

- Hit Die: d6.
- Base Attack Bonus: +3 / 4 levels
- Good Saves: Reflex
- Proficiencies: Assassins are proficient with simple weapons and light armor.
- Skill Points: 4 + Int Modifier.

REQUIREMENTS:
Alignment: Any non-good.
Skills: Hide 8 ranks, Move Silently 8 ranks.

ABILITIES:
Level
1: Death attack +1d6, Use poison
2: Uncanny dodge I, Ghostly visage, Poison save +1
3: Death Attack +2d6
4: Poison save +2
5: Death Attack +3d6, Uncanny dodge II, Darkness
6: Poison save +3
7: Death Attack +4d6, Invisibility
8: Poison save +4, Hide in Plain Sight
9: Death Attack +5d6, Improved invisibility
10: Uncanny Dodge III, Poison save +5

Death Attack: At first level, an assassin may use a death attack, which functions similarly to a sneak attack in that if the target is not in combat they become victim to the death attack. The successful attack forces the target to make a fortitude save or become paralyzed. Even if they succeed with the saving throw they still suffer +1d6 points of damage in addition to the normal damage the attack caused. This damage increases to 2d6 at level 3, 3d6 at level 5, 4d6 at level 7, and 5d6 at level 9. (Note: The additional damage occurs even if the target is engaged in combat.)

Use Poison: The character is trained in the use of poison and never has to make a dexterity check when applying poison to a blade.

Poison Save: Starting at second level, an assassin gains a natural saving throw bonus to all poisons of +1 for every 2 levels.

Hide in Plain Sight: The assassin is able to use the hide skill even while being observed.

I think one of the main reasons Alter Self is not included is due to its ability to give wings and thus flight so it is open to abuse.