I am trying to create end gateway blocks without the beacon effect which from my research can be done by setting the age value of the block to a negative. However, I can't seem to find how to access and edit this value. I have looked through the Block API and the CraftBlock API and am not seeing a way to do this. Is this only possible using NMS code or am I missing something? If the former, how would I go about setting the age value? I am currently building against 1.12.2 but do intend to update to 1.13 once it's available. 1.12 solution is preferable but would love to hear what 1.13 has in store as well.