What is Terrace farm?

I have a question about terrace farm. I have level 91 ToR, i get a lot jade relics, a few every week, but i never get terrace farms from them, except one in the first or second week when GE4 was introduced. However i hear people getting terrace farms quite often compared to the number of jade relics they get with much lower ToR levels. Whats the chance in % to get terrace farm from a relic? Because it doesnt seem to be completely random, as i keep getting the same buildings but never terrace farms, and these are the only thing that is really usefull for me. It seems the Ge rewards from relics are very unbalanced and rely too much on luck, or its like with some events in the past when one player would keep getting the best reward a few times in a row,while another will never get it. Is there some more information that can explain why i dont get terrace farms even tho i have got tons of jade relics, or my tor is a pure waste of FPs due to the complete randomness of rewards or because of set rewards to certain accounts and other accounts have almost no chance to win them?



Please Help.



Thanks !



I didn't find the right solution from the internet.



References:
foruen.forgempires.com/inx.php?thrds/terrace-farm.33427/




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