（bug-report seems not work, so i post here）
I just upgraded my Infused Chaos Docent, but there is no dc improvement for the Phantasmal Killer（the only illusion spell in my sorcerer spell list） when I wear it. I am sure that there is no greater illu focus item on me. Then I got the bardic shipbuff and find the dc enhanced by 1.（but the buff should not stack with greater illu focus）