Puberty

What's it like?
Elemental puberty has different stages, and they're quite distinct. There's the first stage called Trait Puberty, which happens at about two-to-six years (32-96 months on average) of age where an Elemental's defensive traits begin to grow in. The second stage is when they begin to molt feathers and shed scales or fur yearly. The third stage is where they begin to reach sexual maturity and start to have those thoughts and feelings, usually around 12-15 years.

Trait
Trait Puberty is one of the most important times of an Elet's life. It can determine how they're raised, if the adults happen to be Fire or Lightning Elementals (more Fire, because if they have very few defensive traits, they're likely to be abandoned as a lost cause, because they can't defend themselves at all), how others see them, or even how they deal with pain, because traits coming in is kind of a bitch.

Horn/Spike Growth
Given that horns (and most spikes) are literal bones, having them grow in is indeed painful. Quixorite, a type of healing gemstone, is often Blessed and put around an Elet's neck on a necklace to dull the pain and quicken the process. During this time, an Elet's skeletal structure changes and small spikes begin to form on their heads where the horns will be. The horns can be any shape or size, but ram horns are the most common. This process takes a couple of days to a week, usually aided by the Quixorite.

Antler Growth
Antlers are even more painful than Horns and Spikes, and the antlers are often covered with velvet and beads made of Quixorite, lined together with string, to ease their pain. The antler growing process happens faster, but they do still shed on a cycle, yearly, at different times.