Ankheg's Prowess

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

• Increase your Strength by 1, to a maximum of 20.
• You have a base armor class of 13 + your Dexterity modifier, while you aren't wearing armor.
• You gain a base burrowing speed of 10 feet.
• You gain tremorsense out to a range of 60 feet.
• When you take the Attack action on your turn, in place of one of your attacks you can spit acid in a 5-foot-wide, 30-foot-long line. Each creature in that area must make a Dexterity saving throw (DC 8 + your proficiency bonus + your Constitution modifier). On a failed save, the creature takes 2d6 acid damage, or half as much on a successful one. This damage increases by 1d6 when you reach 11th level (3d6) and 17th level (4d6). You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.