Stalaga Spear (Patreon)

Weapon (spear), very rare (requires attunement)

This magic spear is made of dark, polished granite and has a large ruby set in its head. While made of stone, it weighs no more than a normal spear and is enchanted to prevent it from shattering. You gain a +1 bonus to attack and damage rolls made with this magic weapon.

This spear has 4 charges and regains 1d4 expended charges each day at dawn. While standing on or next to unworked stone or earth, you can expend 1 charge as an action to plunge the spear into the stone or earth. The spear vanishes into the surface and emerges as a sharp stone spike that's 1 foot wide and 10 foot long from another surface made of unworked stone or earth that you can see within 60 feet of you, such as the ground or a cave wall. The spike erupts from the surface and forces any creature within a line 5 feet wide and 10 feet long to make a DC 16 Dexterity saving throw. On a failed save, a creature takes 4d6 piercing damage and is pushed up to 5 feet away from the spike. On a success, a creature takes half as much damage and is not pushed.

While you're within 60 feet of the stone spike and standing on or next to unworked stone or earth, you can use a bonus action to speak the spear's command word to recall it. The stone spike crumbles and the spear inside vanishes back into the surface it came from before reemerging from the surface next to you into your open hand. If you don't have an open hand, it falls to the ground at your feet.

A gem can be inside any stone. This is one gem you don't want to be found by.