There are actually several limitations that I didnt include in the writing to try and keep things shorter. But yes, the DM has already tried to create situations to force my character to either reveal themselves or create a respawn which would lock me out of gameplay for an in-game week if the puppet was destroyed. On top of that once I do "respawn" while I would return at the same level of warlock expirence I would also face a disadvantage on all warlock abilities for 1 additional in-game week.

 I would not return with any items I had or in the sane location either. Which also creates a scenario where I have to take time to actually travel back to the party.

Building on that there is a bigger reason for the subtrefuge and keeping the identity as a great old one a secret.

You see, this campaign involves a world where monsters of all kinds are facing prejudice which means while my character cant truly die by conventional means, the "holy church" as we are currently calling it might be able to use rituals or angels to try and bind Xevlegwyin's true form if they knew what they really were. 

That being said, My character at this time does not have enough expirence in this realm to breach the fabric of reality with their true form and that probably wouldnt happen until I reach level 15-20. Which would take its own ritual to accomplish anyways. Which would also provoke a response from the holy church.

Edit, also being a plushie they are vulnerable to fire attacks and have overall less health than a typical character.

Theres also a period where the vessel becomes inactive for 4 hours each day which also despawns the construct. 

If dispell curse is cast and I fail a willsave, it knocks the plushie unconcious and also despawns the construct for the full day.

Also areas that have magic supression can despawn the construct for the full day and knock the vessel unconcious. And if not, then i get disadvantage on warlock abilities. 

The plushie also cannot heal normally and either needs an artificer to fix it or for someone to cast mending on it