There's hundreds of posts on Silent Image; I feel pretty good about my thoughts on this, but want a few opinions.
I'm planning a scenario where the party is about to storm a cavern lair. The enemies know the party is coming and have a sorcerer. In the main entrance of the cave is a deep crevice with a wooden bridge over it.
The sorcerer is going to use silent image to displace the bridge - by creating an illusion of the bridge next to the actual bridge, and creating an illusion of the crevice over the existing bridge. The intent of course is that the first character to charge over the bridge towards guards on the other side will plummet into the crevice. That will give everyone else saves to figure the illusion out, but the poor character wouldn't get a save up until they were falling through the bridge.
It's evil, but does that sound legit?
Silent Image can make a bridge appear, but i can't make the real bridge disappear. Silent Image is a Figment, which makes something appear that doesn't exist. To change the appearance of something that does exist (including to make it disappear) you need to use something from the Glamer subschool.
Mr. Pseudonym has it correct. Another spell will be needed to get rid of the existing bridge. Silent image could make it look like it's worn out and unsafe, explaining why they've built a new bridge.
I would give a save to somebody stepping on the bridge, with a big penalty if they were trying to run or charge. Most adventurers don't put all of their weight onto an unfamiliar bridge. When the first foot doesn't land, they can try to pull back.
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Mr. Pseudonym has it correct. Another spell will be needed to get rid of the existing bridge. Silent image could make it look like it's worn out and unsafe, explaining why they've built a new bridge.
Nope, changing the appearance of a real object is just as much a glamer as making it disappear;
The spell actually able to create the described effect Mirage Arcana.
Hmm. Ok thanks for that. I'll use the Mirage Arcana.
Better yet, have the minions remove the planks at the far end of the bridge, and then cast silent image on the bridge showing the flooring intact.
Same effect, one less spell.