Drop rate statistics - the Sengoku'ing

You can't go into Zero dungeons at all unless you're a Zero, the invite feature only works with other Zeroes.

i suppose you might as well have played on a zero if you were going to get a zero to invite you.

though when i read the instructions i thought it meant that people from the normal maple world could be invited for one-off instances or something. but i never tried it, maybe was a poor wording or something