Magic Items

This stone has a rune on one end. You can take a Utilize action to press the rune, which causes the stone to become magically fixed in place. Until you or another creature takes a Utilize action to push the rune again, the stone doesn't move, even if it defies gravity. The stone can hold up to 8,000 pounds of weight. More weight causes the stone to deactivate and fall. A creature can take a Utilize action to make a DC 30 Strength (Athletics) check, moving the fixed stone up to 10 feet on a successful check.

Earworm

Source: Eberron - Rising from the Last War

Wondrous item, uncommon (requires attunement)

To attune to this symbiont, you must hold it against the skin behind your ear for the entire attunement period, whereupon it burrows into your head and bonds to your skull. While the earworm is inside you, you can speak, read, and write Deep Speech.

Spells. The earworm has 4 charges. You can cast the following spells from it, expending the necessary number of charges (spell save DC 15): Detect Thoughts (2 charges) or Dissonant Whispers (1 charge). Each time you use the earworm to cast the Detect Thought spell, it sends the information gleaned to the nearest daelkyr, or to the next nearest earworm until it reaches a daelkyr.

The earworm regains 1d4 expended charges daily at dawn.

Symbiotic Nature. The earworm can't be removed from you while you're attuned to it, and you can't voluntarily end your attunement to it. If you're targeted by a spell that ends a curse, your attunement to the earworm ends, and it exits your body.

Pour la série (ou game eberron Narco ou autre MJ qui veut bien) :

Quickstone Whisperer

Wondrous Item, Uncommon (Requires Attunement)

This ancient, heavy marble torc is strangely warm to the touch. Though it resembles stone jewelry, the torc is in fact a simple symbiont which grants a limited form of control over earth and the ability to manipulate quickstone without the usual rituals. To attune to it, you must wear it around your neck for the full Attunement period, during which time it coils around your throat like a snake.

While wearing the torc, you can use a Magic action to transform a 5-foot cube of quickstone between its soft and wet forms, or irreversibly change it into its fixed form.

Spells. As an Action, you can use the symbiote to cast Mold Earth or Meld into Stone. Once you use the torc to cast Meld into Stone, the spell can't be cast in this way until the next dusk.

Symbiotic Nature. The torc can't be removed from you while you're attuned to it, and you can't voluntarily end your Attunement to it. If you're targeted by a spell that ends a curse, your Attunement to the torc ends, and it uncoils from around your neck.

AL :

Wand of the War Mage +1

Wand, uncommon (requires attunement by a spellcaster)

While you are holding this wand, you gain a +1 bonus to spell attack rolls. In addition, you ignore half cover when making a spell attack.

Pour la série (ou game eberron Narco ou autre MJ qui veut bien) :

Quickstone Boomstick
Rod, Uncommon (Requires Attunement)

Whenever you cast a spell of 1st-level or higher using this Rod as a Spellcasting Focus, you can choose to release its power in a thunderous burst. All creatures within 5 feet of you (including you) must make a Constitution saving throw against your spell save DC. On a failed save, affected creatures take 1d4 Thunder damage for each level of the spell you cast, and are Deafened until the end of their next turn.