It initially costs 200 gp, and can be upgraded with up to 3 “upgrades” each one costing as little as 15 gp or as much as 550.

Your speed becomes 30.

You can control the chair telepathically.

The chair benefits from any spells cast on you.

The chair retains its beneifts when you Wild Shape or Polymorph (including the upgrades).

The chair has no hit points and must be hit by 3 critical hit melee attacks “in the same encounter” (whatever that means) before needing repairs, but the chair being “broken” does nothing to stop it from functioning.

The chair also beneifts from attuned magic items.

The chair also counts as a mount for the purposes of mounted combat.

The chair gives you advantage against being knocked prone.

You get extra movement speed “going downhill.”

You can use it to attack dealing 1d8 damage, using STR or DEX,

Below is a summarized list of the upgrades.

Advantage on DEX saves and Acrobatics/Stealth checks.

“All-terrain” upgrade I think that lets you ignore difficult terrain?

Advantage on saving throws against certain damage types.

Gives you a +2 AC bonus, critical hits necessary increase to 6, but will give you disadvantage on DEX saves and Acrobatics/Stealth.

Built-in barricades that can grant you 1/2 or 3/4 cover.

Cast a few spells once per day, including Feather Fall, Freedom of Movement, Dimension Door, Grease, Spider Climb, Thunderwave, and Water Breathing.

Turn the chair into a raft.

Can knock up to 4 creatures prone.

Extra 1d4 damage per hit.

Drop enhanced caltrops.

Extra 1d6 damage per attack and imposes disadvantage on target’s next attack.

Spider Legs, increases speed to 40, and does the obvious.

Advantage on Stealth checks.

Let’s replace “wheelchair” with “breastplate” lol