sentences:  However, shortly afterwards, the Tablet is again stolen by professional thief Ghost, who delivers it to Doctor Doom.The heroes are then summoned to the X Mansion by Professor Charles Xavier, who explains that anti-mutant terrorists called the Purifiers have launched a genocidal attack on Mutant Town.The heroes rush to Mutant Town to stop the killings, fighting not only the Purifiers, but also the Reavers, a group of psychotic cyborg mercenaries led by Lady Deathstrike, who has allied herself with the Purifiers due to her grudge against the mutant Wolverine.