Congrats, I would never guess Djinn Apprentice
For Goblin Tower, I now only saw the post so nothing to say, answer make sense tho
Anyway,

1. Dhampir Stalker (real guess, is it because half-half?)
2. Life Sapper
3. Riftwing
4. Skeletal Warrior
5. Undead Minotaur
   @seeweed