A party member without any Orbs or the expansion may still participate, and will be able to deal damage as long as the person who activates the battle used the appropriate orb. (ie. A War without any Orbs may deal slashing damage if an Orb of Swords was held by the person who activates.)
All party members will lose all key items upon initiating the battle.
You will also be put in Level Restriction and Confrontation status effects. However the battle is not capped and buffs are not lost once the battle starts.
Since you get the confrontation status from the fight you will lose all pets you have out.
The fight is limited to a single party (the party of the member who initiates the battle in the case of an alliance) (see testimonials).
Initiating the fight with sneak on will NOT prevent the cardians from aggroing you when they pop.
The Professor consents to lend you her aid, but as expected, there's a price to be paid. Within a Cardian in the Outer Horutoto Ruins lies the reagent she does seek; return it to her, that you might avert a fate most bleak!