nely's page

Hey guys I'm currently preparing the vol.1 of Tyrant's Grasp and I have found that adventuring in boneyard is really fascinating. But I could only find some brief rules of this unique planar from OA. I hope to make this background more vivid and I wonder if there's any reference.
Besides, what happened after living creatures die in boneyard? Did they reborn as a soul? And how souls die in boneyard? As its theme is survival horror and some encounters are very difficult, my idea is to make PC reviving in the adventure and impose punishment once they leave boneyard. But apparently it also works on the living guests in boneyard, which will make encounters become cumbersome and complicated.

Feat Sunlight Summons could make summoned monsters shedding light. And in the Stargazer's class feature Sidereal Arcana, The Lantern Bearer could increase conjure light abilities, to make spell level considered to be 2 higher than normal.
so here's the question. does it work to raise my summon monsters' spell level?
And the feat Summon Guardian Spirit could gain a spirit depending on your summon spell level, so if it is a yes, could i use a 3-level spell slot 'Summon Nature's Ally III' to summon a guardian spirit with 5-level template?