I'm starting to feel very jaded by these events, the last building of the set only seems to be possible if you are SUPER lucky in getting the bonus scrolls, or willing to pay for extra scrolls or diamonds to buy scrolls.
The last few events were the same, i played every day, did all the quests, got lucky several times with additional event currency, still spent 2500diamonds for event currency and still didn't manage to get the last building for Pilgrams Manor, now i'm in exactly the same position with the Forbidden Ruins.
Instead we've got a whole load of buildings and buffs that are pretty useless.