Meaning of (せ)にゃ and から(な)


I found the following two sentences:

あとで添削 **せにゃ** 。- I'll look it over later.

この世界 **にゃ** 魔法ってのがある **からな** - There's magic on this world.

I checked the dictionary and some of the meanings of "にゃ" includes "Having to
do something" and "On", which makes sense on both of those sentences.

あとで添削せにゃ - I'll (Have to) look it up later.

この世界にゃ魔法ってのがあるからな - (On) this world there's magic.

However, **I'm not sure about the usage** of せ + にゃ on **あとで添削せにゃ**

**I'm also not sure about the meaning of からな** at the end of
**この世界にゃ魔法ってのがあるからな**. I assume it's a combination of から meaning from and the
sentence ending particle な which has the same meaning as ね, but I'm not sure
how something along the lines of "From, isn't it" would fit on the sentence.




Generally called "なまり（namari)" or "dialect," "にゃ(nya)" is not a common word
and may be used in very casual situations between friends.

**Please note that it may be considered rude to use it in business
situations.**

"な(na)" has almost the same meaning as "にゃ," but is more formal than "にゃ".

It can be used in business situations and is not considered rude.

