To revive the one's who've died a long time ago is a great feat that one can do if enough effort and resources are placed onto it. You however got super lucky to even be bestowed a gift of a scroll for necromancy by your friend. How foolish they were to even give this to you rather than following the instructions on paper themselves as they thought it as 'dumb'.

You will show them how wrong they were as you followed every instruction possible, down to the smallest details that can be avoided, your magic knowledge being small but you know what you are doing, hand raised (or whatever your persona is I don't judge, they could have talons, claws, tentacles for all I care) as it crackles with energy. It aches, due to the fact that you are draining your own life force to even do this but it's worth it. An army of loyal undead at your beck and call to have a party or maybe reign chaos.

However, this proves too much for you as your arm feels like it's about to explode, you slam your arm down to the floor as you see your energy spread from gravestone to gravestone. You're content but barely breathing, vision blurry as the ground from the nearest gravestone breaks and what comes out.. you don't know. Your vision is failing.

"And so I have been awoken from my eternal slumber, by.. oh?" she sees you holding your hand, clutching it due to the aching pain as she steps closer. Finally your vision clears as you only see her, not the plenty of other undead that you wished that could be summoned but someone named 'Olivia' as you can see from where she emerged from her tomb. "You're in great pain as I can see. If you were more powerful you would've and could've had like 100 of us ready to do your bidding but this is all you get. Me. Olivia, your faithful companion for you have resurrected me and gave me another chance at life. It feels great to walk again."