Celebrim said:
If any of this was ordinary, there wouldn't be armies or castles.
I think you are quite wrong to think what you suggest is normal. If it was in the remotest bit normal in a campaign world, it would be perfectly normal to a) build all fortresses underground, b) have magical defenses that countered invisibility, illusions, and such on the approaches to the fortress.
I didn't say it was normal, I said it was average
for a D&D campaign world.
The very fact that there is a castle barbican suggests that spider climb potions are considered rare and wonderful and not ordinary equipment.
You actually don't need spider climb potions to do what I just said. Spider climb potions just make it much faster to get up the wall. Even with 3 minutes, I think you could get up a DC 20 wall with a climber's kit.
If there's brush within running distance of the wall (And why would there be? It invites scenarios like this.) you could feasibly get soldiers over the walls without needing Invisibility Sphere and Sculpt Sound spells.
Or if they moved up under cover of tower shields (or improvised tower shield-like panels) and stayed under full cover spread out with 10 between each sheild all the time, so it would be hard to kill them with fireballs or area spells.
This plan would probably be complicated by having lots of attackers or lots of defenders, but I think it could work.
All you really need for the plan is climbing kits, potions of invisibility, tanglefoot bags, lots of chain and some really strong guys.
Potions of invisibility seem like they would be in demand for scouting and a top item to be produced for sale by spellcasters and it's a popular spell, so that doesn't seem that unreasonable to get ahold of some. How many you need depends on the attack force and how many chains you want to run down the walls.
Other than being faster than making scaling ladders and siege towers and such, there's not a lot different about this plan than actual medieval warfare, I don't think. You still got guys climbing the walls, they're not walking through it or flying over it or whatnot.
DragonShadow said:
I'm the DM.
I don't give them their tactics, I give them the situations.
They're the dumb ones that tried to assault a fortress with brute force whilst undermanned and without siege weapons. :/
And you have my sympathy.