Edal2007 said:

Situation is like this: Bastion is on lvl 10 and request are stone blocks +  need to downgrade a Bastion of Level 9 or higher by 1 Level

So what that mean? 

- Do i need downgrade bastion only on lvl 9 & 10 and higher lvl don't make request fulfilled?

- Or higher by 1 lvl then my bh bastion which is on lvl 10 so mean that i need max lvl 11 downgrade and lvl 12 don't make request fulfilled?

Thanks in advance 

It is exactly as my favourite (face?)hugger, redbeard, said, but let me try to rewrite the original instruction to make it a bit more clear:

need to downgrade by 1 level a Bastion of Level 9 or higher

In other words, "by 1 level" refers to the word "Bastion", and not the word "higher".

Edal2007 said:

So other words that mean for bh bastion on lvl 10 i can downgrade 9,10, 11, 12 etc and request will be done?

Exactly, and you only need to downgrade it by one level (i.e., once).

Crowbar said:

Exactly, and you only need to downgrade it by one level (i.e., once).