I believe this has been asked many times before, but I would like to retouch on the subject. I am a bit newer to MUDs in general and Armageddon is my first, so maybe I am missing the experience and knowledge as to why these races aren't playable anymore: those being the Mantis and Halflings.
Looking into the nature of the two, I have noticed that both races have a taste for other intelligent beings but as time goes on I feel as if they would have matured from this thought process, as creatures have been known to in-order to adapt to the circumstances. Of what I have come to know of Zalanthas, it is definitely a rather unforgiving world and yet it is the altruism that exists within the communities which allows it to thrive. While you could say that these communities gain something from one another I believe it is really the belief of these beings to help others, because after the needs of survival are met, what then? Most beings find their existence meaningless without the existence of others, no one (not even a mantis) truly wants to be alone.
So, what is my point exactly? Well, I feel that these two races should be reintroduced to the world with this thought in mind, if that was the reason for not allowing them to be playable anymore. I believe it would be fairly interesting for a mantis or halfling to be "accepted" into society slowly, perhaps having to go through painstakingly difficult ways of gaining trust from the other races. I may be not all too familiar with the history of Armageddon either and maybe there is another reason why they aren't playable, but I digress. It just feels as if these races coming back to being playable would add more clever ways to go about roleplaying, especially when you are playing a race known to be more feral in general, yet want to adopt a more civilized take on the world.
Just a thought, thanks for reading!