The units that are huge and say there are relics in them......what do they do exactly?

they ARE relics don't got relics in them

and they are not units, they can transport units and they are kinda what the game is all about ^,^

if a alliance get all 10 and can hold them for 72 ticks they have won

but relics are like slow moving op's, yo can put as many squads on them as u want, and move them with no oil cost