Answer:
They are toothy nocturnal immortals.
It comes from crystal and melts to a treat. Add it to your tea to make it sweet. What is it?
Without this, H2O would just be 2O
An art-form and its colour-ful result.
The more you look at it, The less you see.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?