[X] Yes (Forfeits the CB against the Highlanders, declares war against the Thunder Horse, brings Yenyna out of retirement, ???)
Largely because I never really cared about destroying the HK vs massively weakening/vassalizing them.
Plus, Yenyna may as well train her son in a 'short victorious war'.
Making IC contact with the Swamp Folk, to eventually cripple the Thunder.
If we do all that, I can see us dominating the Lowlands, which we could integrate slowly, eventually starting the population doom-stack we have anticipated for many millennia.
Medium risk, huge reward?
Worst case I can think of quickly, the spirit touched is plotting against us and is or works for an antagonistic Shadow King.