In a discord server, we had a discussion whether or not you can beat Celestial Champion without using or acquiring any grass or twigs
We found that grassless CC is possible (there's alternative methods of getting rope), and hypothetically twigless CC is possible aswell except there's a pretty big roadblock
Moongleams require a bugnet to acquire them, you need 15 moongleams and therefore two bugnets. The only way you can get a bugnet without any twigs is by the beekeeper boon, which has a bugnet.
This setpiece however, is fairly rare (54 worlds had 2 bugnet boons, world was huge and failed survivors was set to insane but I doubt that had any affect) and extremely rare when having two of that setpiece in the picture
Furthermore, we do not know if the bugnet boon CAN even spawn twice, as some boon setpieces cannot spawn twice.
BUT dst is split into two shards, forest and caves shards. If a bugnet boon in caves shard is possible, then double bugnet is possible.
So double bugnet is MOST LIKELY possible (if multiple can spawn in the same shard OR if one can spawn in the caves shard, then this is possible) but we do not know for sure.
Even if it is possible, it could take hundreds or possibly even over a thousand worlds to test. But if a double bugnet world is found, then twigless Celestial Champion is theoretically possible.
(I can also answer any questions about grassless CC/twigless CC)