"Following the events of the Fort Forinthry: Murder on the Border, the Fort is facing a growing threat of an unexplained horde of undead wandering the perimeter. RuneScape players will join forces with their new Slayer Master, The Raptor, to vanquish the horde and investigate where this brand-new type of enemy is coming from. "Unwelcome Guests" will give players their first encounter with the villainous necromancer, Zemouregal, whose role in the story will be explained in coming updates. Fort Forinthry: Unwelcome Guests introduces four brand-new slayer creatures, including the Fetid Zombie, Bound Skeleton, Risen Ghost, and Armored Phantom. Players that conquer these new fiends will earn Slayer Trophies, which provide increasing rewards, buffs, and a rare drop of a new two-handed magic ability. As with all Fort Forinthry updates, the Construction skill will play a vital role in continuing the story. Players will build the Guardhouse, which will provide additional buffs for the Slayer skill, which include additional damage bonuses and higher spawn rates for Elite monsters."
https://bleedingcool.com/games/runescape-to-launch-fort-forinthry-unwelcome-guests-next-week/
Very interesting slayer updates coming next week. Seemingly we see the Phantom of RS3 joining the growing list of Jagex undead.