you can have 3 vision you can have the normal dark vision but you can choice instead have tremosense or you can have blind vision.

If you want you can add something special to your character whit his apperance it can be something it exist like am advantage at climb or somthing totally new like you have 4 arm you can do 2 action at same time but whit disadvantage it have be worm whit your dm and if you want you can just skip it

You became hard to kill now at level 5 you have advantage on death saving roll

you ar an undead so that mean you ar weak agains radian damage bruh

because you ar an undead you hate vegetable every time you eat good berry you have make constitution saving throw of dd15 or you lose 2d6 damage of acide by vomithing and you lose 1 day of eating 

 when the guy creath you he guived you muscle that nice no need training for them. you gain a bonus of 2 at strenght and 1 at constitution