F12 key on keyboard for the in game civpedia. it tells 95% of everything there is to know about FFH2.
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the calabim is NOT an easy civ to truly play well.
in a competitive game, it's hard to take full advantage of their abilities. you won't be able to feast much or it'll bring your cities/game down and probably lose.
maybe the best idea for a competitive game, is to try to get a powerful enough force to take a(n) (ai or human city), THAN feast on those captured cities dry (down to population 1).
it's probably better/easier to get their hero unit losha, and use her to take cities. u won't have to feast as much since she is a hero unit and get +1 exp per turn. when she kills a living unit, she becomes immortal. she can grant ANY unit vampirism allowing them to feast (powerful when u do on magic units). i'm pretty sure she has higher str than vampires but i'm not sure about the final (national) units, vampire lord (immortal) and brujah (berserker).
the calabim require many things to really utilize their full powerful potential. this is very hard to do in a competitive game. it's really a balancing act that requires you to be at the veteran-pro level of a player.
the biggest thing to know:
FEASTING is very nice, but it's limited. so don't rely on it too much in a competitive game.
also this is really helpful to know:
*the governor manor building gives +1 production for each unhappiness in a city. this allows u to get extra production as u FEAST your city and make unhappy people. also u usually have farms and nearly no production, so this is a way to get production.
it's better to do all your FEASTING in-on 1 turn. this is because, all the unhappiness u make will go away in 10 turns. whereas if u FEAST each turn, 10 turns only removes 1 unhappiness than another turn to remove anohter unhappiness. it jsut builds up and takes longer to get rid of all the unhappiness. when u feast all at once in-on 1 turn u only get penalized for that 1 turn. if u feast each turn u get penalized and penalized. this is much worse. just don't over do the FEASTING and bring your civ down into ruin.
i'd have a single city be your feasting city. build the city based on the fact that u need as much food as possible. build all the farms u can. build breeding pit, granary, and the other like building (forgot it's name. its the same as the granary but gives health bonus for cows, pigs, etc.) as these help your civ grow back faster. do NOT build anything important here otherwise, because this city is going to shift between 20+ pop and ~5 pop constantly.
use otehr cities to bring in your commerce and such, since they always stay big as u aren't feasting off them.
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in a non-competitive game:
u can city spam REX and have a huge empire. completely farm up the empire. get the food techs, economy techs, civics, and vampire-losha techs. get a religion. build happiness and health buildings and get the techs. etc... than FEAST all u want with your super massive farm cities.
as u can see this is completely impractical in a competitive game. the calabim seem like a good civ for new players, but for competitive play it really take a veteran or pro player to play the calabim.