Awakened Soul Gem of Jeive

Crafted by a powerful wizard with the soul of an old "hero". Now inserted into the flesh of Grimgrum, the true wielder of the gem, its power has grown significantly.

Soul Shape: Roll a D8. The soul inside the gem fuses with your own, granting random benefits. The wielder goes through a transformation gaining abilities based on the rolled form. Each form lasts one minute.

Powerful Artifact: This artifact and the power it draws on is immense. A Form can only be used once a week. The wielder can attempt to draw on this power sooner, but to their deficit. If used before the gem fully recharges, roll a D4. On a 1-2, you gain long term madness and on a 3-4 you gain indefinite madness. DM also rolls d100. On a 90 or higher, Jeive can take control.

1- (Red) Dragon Form: You turn into a draconic creature, sprouting wings and scales. 80 ft flying speed. +4 AC. Fire Breath: 30 ft Cone where enemies must succeed a DC 15 Dex save or take 10d8 fire damage (Regained on a 6). Enemies cannot take opportunity attacks if you are flying. 

2- Lightning Form: Your grow taller and your body crackles with electricity. Your movement speed becomes 120ft. +4 AC. Dash can be taken as a free action once per round. Your weapon attacks deal an extra 2d8 lightning damage. You can cast chain lightning once without consuming a spell slot.

3- Giant Form: Your body grows into an immense size, along with all items you carry. You are considered gargantuan, and deal double damage to structures. All attacks deal an extra 6d6 bludgeoning damage. Movement speed is doubled.

4- Form of Adamantine: Your skin grows a thick layer of adamantine, making you near impossible to harm. You gain +10 to AC and critical hits no longer effect you. Your unarmed strikes are considered magical and deal 2d10 bludgeoning damage.

5- Frenzy Form: Your eyes glow red and your muscles triple in size. You go into a state of frenzy where you can no longer tell friend from foe. You gain +15 to all attack rolls, and any rolls higher than 10 are considered critical.

6- Form of Shadow: Shadows swarm you, turning you into a creature of night. +15 to all stealth rolls. You can attempt to hide as a free action and may hide without cover. Shadow Step: You can teleport to wherever you see as a bonus action. Can cast Darkness as a bonus action and see through all magical darkness.

7- Jeive Form: You let Jeive take over, and grow into the form of a goliath. (Use Jeive's character sheet)

8- ???

Notes: To attune to this item, the owner must activate the gem and allow it to insert itself into their flesh.