Relevant parts of the spell:
Effect one invisible, mindless, shapeless servant
An unseen servant is an invisible, mindless, shapeless force that performs simple tasks at your command. It can't perform any task that requires a skill check with a DC higher than 10 or that requires a check using a skill that can't be used untrained. This servant cannot fly, climb, or even swim (though it can walk on water). Its base speed is 15 feet.
The servant's size is never mentioned, only described as shapeless and cannot fly/climb, so:
* Can a servant reach something on a high shelf? (aka, can it act as if reasonably tall?)
* Can a servant reach an item at the top of a straight vertical cliff? (can it act as if extremely tall?)
* Can the servant fit through a cat-door? (can it act as if reasonably small?)
* Can the servant fit through a small water-pipe? (can it act as if extremely small?)
* Can it fit through a door for a tiny-sized creature at shoulder-level for a medium sized creature? (acting as if reasonably small, at a place that requires reasonably height to reach?)
* Can a group of unseen servant's block someone's movement? They seem to be corporeal, and can trigger some pressure plates, so I don't see why a group of them couldn't push back against oncoming adventurers, while being invisible and immune to attacks.
* If someone can see invisibility, can they see the servant at all? It's said to be shapeless.
* If it's truly shapeless/disembodied, what does 'cannot fly' mean? 'can only affect things within X distance of the ground'? what's X?
* They cannot climb. How steep of a slope stops them?
|
1, 2, 3, 4, 5, 8: The servant can open a normal door, but not an abnormal door. I think that means it can reach the handle of a normal door, which is within 5 feet of the ground, as are normal drawers and lids. A cat door is not a normal door, so the servant can't open it. If it's already open, getting through it is not a simple task for an entity that finds it simple to open a door. I might suggest it's most consistent to consider the servant's size as Small.
6: This would be a combat manoeuvre. The servant cannot attack in any way. It could hold up an object as an obstruction, which would probably require a combat manoeuvre to push it out of the way, most similar to an overrun. The servant's CMD is 10 + 0 (BAB) - 4 (STR) + 0 (no DEX score) = 6.
7: Things that can't be seen with see invisibility specifically say so. The spell would reveal a vague, shapeless presence.
9: A slope that would require it to climb, which I've suggested elsewhere is either greater than 60 degrees, or between 45 and 60 degrees and without adequate footholds.