Battle of Deities
It was a blatant scheme from the start by the Coincidental Luck System that had already garnered favour from two Grade 2 Systems to be fostered upon and nurtured into the next Grade 2 System.
After all, in terms of wit, ability, capability, and adaptability, the Coincidental Luck System was at the top of its Genre.
The only realistic rival it had was the Destiny Luck System. And, when Chenger had been killed, all of Destiny Luck flowed into Straxia, causing the Destiny Luck System to rapidly form there.
This was their actual arrangement. After all, Straxia was a suitable Host to all the Luck-based Systems. She was a suitable Host to a variety of Systems in fact.
Hence, they had enacted this scheme. And that was to take advantage of this fight against the Main Character, using it as a tribulation to fuel their growth and become stronger rapidly.