Purple Worm Power

You have developed traits similar to those possessed by a purple worm, granting you the following benefits:

• Increase your Strength or Constitution by 1, to a maximum of 20.
• You gain a burrowing speed equal to your walking speed.
• You gain tremorsense out to a range of 30 feet.
• You can burrow through solid rock at half your burrow speed and you leave a tunnel, that is about 3 feet in diameter, in your wake.
• When you hit a creature with a melee weapon attack that deals piercing damage, you can use your bonus action to force the target to make a DC 19 Constitution saving throw. On a failed save, the target takes 6d6 poison damage, or half as much on a successful one. This damage increase by 2d6 when you reach 9th level (8d6), 13th level (10d6), and 17th level (12d6). Once you use this feature, you can't use it again until you finish a long rest. Starting at 11th level, you regain all expended uses when you finish a short or long rest.