Undercommon 5e (likewise Profound Discourse) is the exchange language of the Underdark. Pretty much every shrewd Underdark animal speaks Undercommon. It is a blend of Drow language, Dwarven, and surface Normal, and even has some Troll language and other “lesser” words tossed in, yet it is based basically off the Drow language initially.
This language was initially made by captives of the Drow to convey between one another as captives of different races started connecting. It, in the end, developed to the point that it turned into an exchange language inside the “lesser” Underdark races since such a large number could talk probably some of it.
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Drow is commonly hesitant to speak Undercommon 5e since the presence of this tongue is an affront to Xanalress. An option the Drow of Arelith use is placing in “Drow words” in their sentences, in any event, when they simply talk normal, to give it an additional touch.
- Influenced by: Drow 
- Script: Elvish
- Spoken by: Underdark traders
Gnolls don’t know Undercommon, for they are not initially from the Underdark, nor have Drow kept them as slaves frequently.
No, you ought not to accept he knows the language on the off chance that you don’t get it from your race or foundation. On the off chance that there is no standard giving you the language, you don’t have it.
- Script: Elvish
- Type: Language
- Typical Speakers: Underdark Traders
Remember that your character needs not to originate from the Underdark so he may in reality not know the language. Surface Drow is a thing in some settings. He may likewise originate from the Underdark and never tried to gain proficiency with the language of the “lower races” living there. In certain settings, Drow is very bigot.
On the off chance that you have a substantial motivation to know the language, you may deal with your DM to get it. You may surrender one of your dialects however this would be hard as you just have Normal and Elvish. Surrendering Basic would be awful as you would presumably require it to converse with the other gathering part and surrendering Elvish would likewise be unusual.
This would fundamentally mean making your very own custom foundation. This is genuine however needs the alright of the DM and ought not to bring about preferences for you. So you should investigate what you could bargain in to get Undercommon if you truly need to have it.
If your DM has a pleasant day and you have a substantial motivation to know Undercommon he may offer it to you for nothing. Be that as it may, having something to deal with would help.
I would possibly give out the language for nothing on the off chance that I don’t plan to go to the Underdark at any point shortly with my crusade. That would lessen the language to a style thing witch would be for nothing.