Humans can add affinity and learn
techniques with any element, but can only
wake one symbiosis and it's harder to reach
it than the rest of races.

That's why, even if they can change
equipment, they usually stick to one
set or similar ones, in order not to lose
any affinity with the element they
have chosen.

Salamanders have so
many affinity with fire
that they do not need to train
it, and usually learn techniques
of a second element, commonly
being lightning, like the call of thunder.

Ah stop speaking, they have finaly got past the wall of fire!