this event is a special missions (please dnot make it paid and if yes, send me this for free steam:zx2121) thet you serch for five stones made from the Specialest minerals thet created by the core itself.
each stone protected by monsters:
Crimsonite-beasts,gremlins and fiends
Moonstone-constructs and gremlins
Valestone-beast and slimes
Luminite-constructs,slimes and undead
Dark Matter-fiends and undead

story=the spiral hq whont you to investigate the unknown activities of the monsters in tier 2
you catch a grenlin and he tell you all about the stones.

there are 6 missions:
the first investigate- what going on down there?
crimsonite- the stone of strength
moonstone- quest for knowledge
valestone- the life
luminite- the power of wisdom
dark matter-the dark spot

prizes- every mission (exept from the first) give you a special sword made from the mission mineral with his own elemntal power:

crimsonite- fire
moonstone-shock
valestone-poisen
luminite-stun
dark matter-curse

in the end of any mission, a boss will protect the stone and the boss made from the stone he keep and attack with elemntal power and power (like the swords)

im sure you will have lot more to add and i whont you will add it more.

hope you like it Xsword-Master