I don't have the 4E Monster Manual yet. I was wondering if someone that does and is familiar with the 3E vampire could explain the differences to me.
I'm curious to know 'cause I'm considering creating a vampiric inspired base class.
Do you mean Vampire Template? That is in the DMG (page 181) not the Monster Manual.
If you want to compare Templates sure.
4E:
Necrotic Resistance (based on level)
Regen 10 (stops for 1 round if hit by radiant damage)
Vulnerable: Radiance 10.
Action point: 1
Saves +2.
Defenses all go up by 2 (AC, etc)
Gain Darkvision.
Gain 3 powers:
1) Blood Drain
2) Mist Form
3) Dominating Gaze (minor action)
Are Elite so double hps.
3E:
NA +6, Con goes to 0 (meaning lose all Con bonus), but HD go to 1d12 (meaning 1 or 2 points hp go up; usually less than Con bonus).
Gain Slam attack (if hit by it gain 2 Negative levels)
Fast Heal 5 (as long as above 0).
Resist Cold/Elec 10. Spiderclimb.
DR 10/Silver +magic.
Ability: Str +6, Dex +4, Int +2, Wis +2, Cha +4.
Powers:
1) Blood Drain
2) Children of the Night
3) Dominate
4) Alternate Form
5) Gaseous Form