Do you have a reference for a sonic energy enhancement? If there is I'll allow it, but otherwise possibly not: since it's the rarest energy resistance type by far, why would anyone ever choose anything else? (In other words, if it is official, don't ever pick anything else; sonic being good vs objects is just gravy.) I usually encourage truly 'lateral' item customization, though, like a Flame Tongue which is a scimitar instead of a longsword or whatever.<br/><br/>EDIT: Looked up MIC and I see what they did; Screaming is 1d4 sonic rather than the 1d6 other energy types get.<br/><br/>The rules for damaging sections of walls are a convenience, so that every brick doesn't have its own HP. I agree that 5x5 would be a more natural 'unit', but since this use case (needing a passage for Medium creatures) is probably the most common one, the playtest calibration is probably oriented around that. (In other words I wouldn't be inclined to half, quarter or one-eighth the HP for a 5x5 section, but if anything to use that number and increase the amount for 10x10).<br/><br/>Also, while I'm no demolition expert, I imagine that one might end up breaking out a larger section than strictly necessary by accident, due to the way masonry will suddenly crumble in chunks. You could roleplay it that way, and unless you are regularly breaking 10x10 sections of walls, doing this won't break (ha-ha) verisimilitude.<br/><br/>And/or, I bet that once you have a hole in a wall, it's easier to widen it since it'd be 'jagged' and losing structural stability (In other words, the HP for a 5' wide section would only be slightly less than a 10') than it was to start the gap.<br/><br/>In my experience, if you Sunder enemy weapons, be prepared for other players and PCs to be upset that they just lost hundreds (if masterwork) or thousands (if magical) of gp worth of loot. Most people prefer disarming.