[Server] Slayer task (bosses) + other small suggestions

[Pro Noob]

Originally Posted by Jabast

This could easily be done by introducing crystal keys & chest, and perhaps changing the current crystal key into a different one? or is that too much of a hassle? Crystal chest could then have an extremely low chance of introducing something new.

We are not going to change current content. There is more item id's that we are not utilising that could work. May it be key, or may it be something else.