How can a
ring of discretion hide something that is too big to be stowed, and thus must essentially always be wielded, such as a longspear?
What about a goblin-made junkyard armor mech suit that, for all intents and purposes, makes you large size whilst wearing it?
ring of discretion hide something that is too big to be stowed, and thus must essentially always be wielded, such as a longspear?
The short answer is no you can make it invisible while you are wielding it:
A ring of discretion magically conceals any armor and sheathed weapons you're wearing by either turning them invisible or creating the illusion of ordinary clothes. The ring doesn't change your appearance beyond concealing weapons and armor. As soon as you wield a weapon affected by the ring, the weapon becomes obvious to onlookers and is no longer affected until you sheathe the weapon for at least 1 minute. A creature can use the Seek action to examine you and disbelieve this illusion (DC 15), and it can attempt to do so without using an action each time it hits you with an attack.
But mechanically nothing really prevents you to carry on the back it will just be a "bit" higher and may become a bit difficult to pass through some doors but its not impossible.
What about a goblin-made junkyard armor mech suit that, for all intents and purposes, makes you large size whilst wearing it?
Err...
