Flumph's Gift

You have developed some traits similar to that of a Flumph, granting you the following benefits:

• You gain fluency in Undercommon.
• You can’t be surprised by creatures with any form of telepathy.
• You can speak telepathically to any creature you can see within 60 feet of you. Your telepathic utterances are in a language you know, and the creature understands you only if it knows that language. Your communication doesn’t give the creature the ability to respond to you telepathically.
• If a creature within 60 feet of you uses telepathy to communicate, anything shared through the telepathy is also shared with you, including words, images, sounds, and other sensory messages. The creature using telepathy doesn't know this.
• When you hit a creature with a weapon attack, you can use your bonus action to deal an extra 1d4 acid damage to the target. A creature that takes this damage must make a Constitution saving throw (DC 8 + your proficiency bonus), at the end of each of its turns, taking 1d4 acid damage on a failure or ending the recurring acid damage on a success. 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.