@armorl3gend... There is another way to make the hill and it is by exporting your castle and editing the terrain and editing it outside of the game editor using notepade.
{"l":["tg","mg","bg","wc","id"],"r":["rw","rwc","rs","rsc","ri","ric","rb","rbc","rfb","rpb","rrb","rf","rl","rr","ra","rp","rc","rsl"],"c":[],"n":"","t":[230,230,230,230,230,230,230,230,230,230,230,230,230,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,230,230,230,230,230,230,230,230,230,230,230,230,230,0,0,0,0,0,0],"o":-1,"":""}
Where you see in the code - ,"t":[230... etc] that is the terrain code and there are 50 numbers. These represent pixel heights of the terrain. 230 is the highest and -20 is the lowest. Sometimes I like to edit the terrain first before building the structure so that I know I can place elements on them easily and precisely. There are lots of discussions on this thread albeit, 259 so far that discuss editing outside AG to get the precision that you want. Go ahead and experiment and if you have questions, we will try to help!