+2AC when submerged and advantage on saving throws. 1d4 health restored for every minute submerged 

Use one action to devour one creature within 5 feet. The target must make a STR check to beat 16. On a failed save, the target must take 1d6 acid damage, and will continue to take this damage every turn until the devour ends. During a devour, both the gelatinous orb and the creature are treated as incopacitated. On a successful save, the gelatinous orb takes 1d4 damage and the devour ends. If the creatures hp reaches 0 while being devoured,  the creatures body is absorbed and the gelatinous orb gains 1d6 hp. For the duration of the devour, the creature and the slime are treated as a single creature for attack rolls, taking the lower AC or modifier. Damage is applied to both creatures, but is calculated separately.  The gelatinous orb may end the devour as an action. 

The gelatinous orb can fit through any hole larger than one in by one in and can store its carry weight in its body, showing no external sight of the objects within. Nothing can be removed from the orb’s body against its will. Things can be absorbed by the slime at a rate of one square foot per second and expelled at the same rate. Food and living creatures will be destroyed if placed inside. 

Release acid that cannot damage creatures, but can eat through metal at a rate of 1d4 inches per minute, stone at a rate of 1d6 inches per minute, and wood at a rate of 1d8 inches per minute. This acid cannot be captured in vials and concentration is required to perform this action. Movement speed is reduced to 1 during use. This ability can be used to dig holes, break through doors, melt locks, etc.