More questions for you D&D sages out there. We're nearing the final battle for this story arc, and my group of highly inventive PCs are churning out some appropriately inventive solutions. I'm still getting used to my DM wings, so I'd appreciate any feedback you have.
1) One PC plans on crashing his flying boulder into the opponent. The boulder is actually a stronghold (from the Stronghold Builder's Guide) that he created that's about 60x40x20ft. I'm planning on giving him an attack bonus of his Ride skill minus the Size modifier (>Colossal. probably -12). Is there a better way to go about this, or is there something I missed?
2) One PC will probably be wielding a futuristic weapon as described in the DMG against a creature with damage reduction 10/adamantine. I know it's probably a DM call, but if you were the DM would you reduce the damage from something like a laser or antimatter rifle? I'm going back and forth on this.
3) Let's say one Small PC is backhanded by a Large creature with the express purpose of knocking him/her out of the way. In many movies/books/games you see this character flying backward with the breath knocked out of them, but still usually conscious. Is there a way to express this, or would you count it as Subdual damage and let the character get knocked unconscious?
They've got a week to plan this thing out, and these are just some of the suggestions from a 24-hour period. I love my group. If you're bored and feel like reading some of the group's stuff, you can see it at you_do_what.