Hi guys,
it's been a very long while since my last game, so I don't remember rules properly.
What kind of concentration DC does a successful trip attempt imposes to keep spellcasting? Is it ruled anywhere what kind of motion (vigorous, violent, extraordinarily violent) it is?
Also, on a related note, how do you resolve multiple sources of distraction that happen at the same time, such as a trip followed by an improved trip attack? Or even being damaged under bad weather, for low level games?
Do you make separate rolls, or is there some rule to add to the DC? Just plain old +2 DC for unfavourable condition?
Can't find anything on the rules compendium.