Elemental orientation and creaking damage immunity to fire

Creaking, being tree-like creatures, shouldn't be immune to fire or lava damage. It makes sense for fire to be a vulnerability for them. They should also be vulnerable to a sword with the Fire Aspect enchantment.

This can be important, particularly for newer players, but not only, in order to enable killing them instead of having to find their creaking heart, or having to run/fly away.

Creaking behavior once struck with fire/lava would be easy to add, since existing mobs already seek water to quench flames. Creaking could also regenerate when coming into contact with water. In a sense, they would be more "elementally-oriented". In this example, water is a strength, while fire is a weakness. The same principle could be applies to other existing and future mobs. In fact, one such example now sort of exists in the happy ghast's affinity to water and snow balls.