This is real cool and opens opportunities for new characters, nice.

Thank you! Hope you enjoy it as much as my players did... (:

So at level 4 i get a better version of the rogues level 14 skill? nice!

Hmm, sarcasm aside, PandaB13r does have a point, this should be made with what already exists in the official material in mind. Honestly I think the most annoying thing here is the general ambiguity of blindsight and the fact that the rogue's 14th level Blindsense ability arguably doesn't technically give you blindsight, its just an ability similar to blindsight instead of just "you have blinsight up to a range of 10 feet"

I would kinda lean towards it should essentially read like a rogue's 14th level Blindsense and be reduced down to 10 feet of "blindsight" but also specify that if the character already has "blindsight" from a different source it instead increases the range of it by 10 feet. (similar to the way some things affect darkvision, like the gloomstalker ranger's umbral sight from Xanathar's) Personally I think the advantage on perception checks relying on hearing and scent is unnecessary but that feels mostly like flavor I suppose. I don't actually think you need to specify the "Your blindsight can only work in a setting where your character can use his other senses, like hearing and smell." part but I appreciate the thoroughness of it.

Shouldn't that be 'their', not 'his'?

"in ways others couldn't begin image."

Should be: "in ways others couldn't begin to imagine."

I think the description should be clearer that the character doesn't actually have darkvision--only that the character is using his other senses so well that it's like he/she HAD darkvision.

This is great for some of my characters, because they wear blindfolds for backstory reasons! Thank you for making this to spark our imaginations!

My only concern is this is very appropriate for a 1st level character, but less so for higher levels where it's unclear when they've been practicing these things.

This is a benefit that would take years, not weeks. 

Hello DublinAssili,

Thank you for the interest, so glad you like it!
This is one of the first feats I put up here for one of my players. It was meant to be introduced as part of the background of the character.  They loved it & it has brought a great deal of interesting moments in our campaigns.

Hello ParasolSyndicate,

I understand your concern, and a feat like this (like any homebrew feat or item), is really meant to be approved and agreed upon by both player & DM.
In one case it was done as part of the character's background story (born sightless).
In another campaign (once the player expressed interest in the feat), we introduced an NPC a few levels before the next ASI, and elements of blind training became a part of the player's daily/nightly activities. Once she reached the appropriate level she played her character as finally reaching a level of proficiency that she felt confident enough to use it in battle, it actually played out pretty great.

Let me know if you decide to allow it in your campaign, & how it goes if you do. Hope you have a great time!
 

this is a really cool Feat. i will for sure be playtesting this with an npc. good job