Plugin Coded to work in 1.6.4 (the stable first release will be coded for 1.7.*, just too many bugs in those versions yet, keep the good work Bukkit :D)
THIS IS A BETA, 100% PLAYABLE BUT LIMITED, that means those features are STILL under development:
You can't UPGRADE towers.
You can't SELL towers.
You can't ADD ABILITIES to Invaders.
Only Abilities enabled for towers are "explosion" and "arcane".
Not all entities and projectiles have been tested! Expect errors if you try to do weird things!
You can't see remaining Invaders in the ScoreBoard.
You can't customize lang files.
BETA VERSION!, no bugs found but there're missing features!