bloods are scenarios where you kill each other with units that spawn endlessly.
B&D means to Build and Destroy (if i don't remember wrong), where economy does not matter, and building military infrastructure and armies count.
RPG are Role-playing Games. I'm suprised that you don't know what it is its like a story-based scenario where everything centers on one unit...
-------------- :€§Œ:"War shall he have and hatred undying..." :€§Œ: --------------
-Feanor,of the Noldorin Elves, echoer of lies,
Valinor, Land of the Valar
~+@+~
:€§Œ: Proud Member of the Lonely Knights Clan! :€§Œ: