Is this item considered a mount? Is the character considered to be mounted when using it? Can he be knocked off of it? Teleported off? If he teleports, does the broom come along?
[RPG] Does a Broom of Flying work like a mount
dnd-4emagic-itemsmount
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If you absolutely must have these creatures in combat and only in combat, then your only option is to turn them into figurines of wondrous power like the Bronze Griffin (level 19) and the bloodstone spider (level 11) Note well, your blade spider has errata applied to it, so it may not be as useful as you think it is. They exist at every level (therefore, have them priced at the level of the creatures) with the text:
"Power (Conjuration) Daily (Standard Action) Use this figurine to conjure a [creature] (see below for statistics). As a free action, you can spend a healing surge when activating this item to give the creature temporary hit points equal to your healing surge value."
Just note that their hitpoints should be significantly lower than a "real" creature's, to reflect their eternal nature.
The reduce beast ritual (level 7, Dragon 405) is almost what you're looking for, but as the beast takes a few turns to grow, it's not appropriate for in-combat use. It is reasonable to house rule a paragon tier version of it that works with literal pokeballs. Note that most rituals are designed to not be combat appropriate, so make sure there's a significant cost involved with this.
Beyond that, I'd recommend rituals for swapping things out before you go into a dungeon.
There are many options that exist for Arcane familiars, like the Safe Retreat (level 15), unfortunately, they don't work particularly well for more... "real" things.
I would use the Primal Grove, not least because it's one of my favourite rituals for moving armies around.
The primal grove ritual (Level 19, primal power) creates a persistent extradimensional space:
A grove generates enough food and drink to sustain its occupants and has a moderate, unchanging climate. If you move objects into a grove, they remain there when you leave,
So it's a great place to keep people. With 10 minutes (or fewer if you specialise) and 4k (which at the levels you're talking about is literally pocket change). The 10 minute casting time is handy because you can't pull it out during battle, which means it doesn't need to be balanced for battle.
Alternatively, if you read the hireling rules liberally, it seems to be viable to have a level-appropriate hireling (cost * 3 equivalent to sage) be able to cast specific rituals.
What you'll need, therefore, are 3 pairs of sending stones (level 11) and 2 ritualist casters. The follow the voice ritual (level 16) allows the caster to teleport to the location of the last activated stone:
You fold yourself and each ally you choose who is within 3 squares of you through a sending stone you hold.
The real trick is that there's a 24 hour use limit on pairs of stones and casters.
Therefore, there are two operations that you'll be performing: "sending" and "receiving" The sending operation has one pair speak to you through one of your personal stones, the first one casts follow the voice, teleports himself, his buddy, and your ally to you. They drop off the ally, collect whomever needs collecting, and the casting buddy returns.
The third pair of stones is for your fellow PCs. Sometimes, you'll want to teleport an injured companion back, and you'll need to home in on a PC's stone instead.
The intent is probably that only whoever activated it can use it.
functions like a mundane broom until you stand astride it and speak its command word.
Activation requires physical contact. From my reading, this intent is given by the use of you, in every sentence. Usually it would be unclear who exactly is "you", but the earlier sentence defines it (as the person who stood astride and spoke the command word).
You can send the broom to travel alone to a destination within 1 mile of you if you speak the command word, name the location, and are familiar with that place. The broom comes back to you when you speak another command word, provided that the broom is still within 1 mile of you.
The wording, if it was intended that any creature could use it, would probably be "A creature that says the command word", for example.
As an additional conjecture, it would be silly that anyone hearing the command word could mess up the item easily like that.
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