His theme

[Asriel]
Leave me be, say goodbye
You can't help, why must you try?
Why must you stay with me
Your battle's won, go with your family

I don't deserve your mercy
If you won't fight, please just leave
No one came, or heard my call
I'm so glad you took your fall

Forgive me, stay with me
You're the last light I'll see

[Frisk]
It's not fair to be alone
After what you've been through
So let me just ease your pain
Please let me stay with you

I'll continue to reach out
I won't abandon you
Determination fuels me
To keep trying to save you

I will give you my mercy
Because it's clear to me
Fighting won't solve anything
Forgiveness isnt easy

I will stay here by your side,
I know it's frightening
To think that you might now leave
But that my friend is why

I will spare your life always
And hold you tight and close
We will be together here
Until it's safe to go