Relationships. Sliver: Blaze's boyfriend. She does get annoyed with his social awkwardness, but, still loves him dearly. She admits she wants to start a family with him.
In addition to normal weapons, Blazes can be hurt by snowballs, taking 3 (1 1/2 hearts) per hit. If they have found a way into the Overworld, they are also damaged by water and even rain: Water does roughly 1 damage every second. Like all Nether mobs, they are not damaged by fire or lava.
