User blog comment:Metadwarfosis/In anticipation of volume 11- Dwarven Kingdom and Expectations/@comment-72.20.138.102-20160817182214/@comment-27008999-20160818115912

Slane T. may have used downfall of castle and country on PDL's puppet armor? If not, the first reason could be that PDL spared ST because he cannot leave the guild of one of the 8GKs in fear it may be taken over or something might happen to it. The other reason I can think of is that PDL is wary like Ainz, so he might think ST hides other trump cards aside from that single world item, therefore won't take the offensive.

ST thinks PDL might attack them if they use Zesshi, so they are also holding back.