I started playing a Lurker in the Deep warlock (from UA: Sorcerer and Warlock), and have now updated it to a Fathomless warlock (TCoE, p. 72) due to the recent update.
In a session, we encountered a situation where my Fathomless warlock's tentacle (from the Tentacle of the Deeps feature) was the only thing in attack range of someone, and our DM decided to have them attack the tentacle, at which point the DM asked me how that works.
As far as I can tell, there's nothing describing what happens when it's attacked/if it can be attacked. I assume a lot of this is up to the DM, but a lot of how the tentacle works is very vague in terms of it occupying physical space.
Can the Fathomless warlock's Tentacle of the Deeps be attacked?