Ok...Part 1 Modrons were updated here
[spoiler]http://www.wizards.com/default.asp?x=dnd/we/20010921a[/spoiler]
Planar Shepherd picks Clockwork Nirvana of Mechanus as chosen plane,
Wildshapes into a SECUNDUS for 20th level Cleric Casting AND 20th level Sorcerer Casting,
Shapechange(whichever order) into a TERTIAN for 20th level Cleric casting AND 20th level Sorcerer Casting,
Do I now have 20th level Cleric spells, 20th level Cleric spells, 20th level Sorcerer spells, 20th level sorcerer spells + whatever druid casting?
or
40th level cleric spells, 40th level sorcerer spells, + whatever druid casting?
or
something else?
also whats the new shapchange HD limit (40 + 2x druid cl), (80 + 2x druid cl) ?
can cleric cl count since shapechange is in animal domain? so then cl (160 + 2x druid cl)?
if gestalt cleric//druid(160 + 2x druid cl + 2x original cleric cl) HD
Part 2 Native Creatures... modrons for sure, their entry specifically states that they are native to mechanus.
DMG lists Heavenly and Hellish encounter tables for mechanus, Manual of the planes states(paraphrasing) it is infinite in size and lists inhabitants from the material plane, the nine hells and celestia, and formians... a few others,
what counts as "Native" for PS wildshape purposes? (mechanus or otherwise) pure DM fiat?
Edit: if nothing else, a druid5, planar shepherd9 can wildshape into a 14HD HEXTON that has 18th level cleric casting with the Law, protection and war domains,
how can we can get the plant domain? (besides gestalt druid//cleric), we would then have shapechange witch leads to the bigger modrons then to more 20th level caster lists...
Planar Shepherd handbook, if you are not familiar with it...
[spoiler]http://community.wizards.com/go/thread/view/75882/19871574/The_Planar_Shepherd_Handbook?pg=1[/spoiler]