We checked how much remaining Rena we have in the server (total) and we thought that with collective efforts you can achieve better (but not too much) bonus to the event.
For each 10 extra Rena over 150 you got +1 golden mob starting from the weakest.
Example: 160 Rena = +1 Golden Goblin, 170 Rena = +1 Golden Goblin, +1 Taikan and so up to the top, and then a new set starting from Golden Goblin.
Everything else remains the same.
Go go go!