Do mid level surfacers turned UD slaves gain UD writs?

[Ceyella]

Do mid level surfacers turned UD slaves gain UD writs? I have a level 8 who might become slave but im wondering if that would make all future leveling writless as i lose access to surface, or if i would gain access to UD writs to keep going?

[Edens_Fall]

They do once the collar is on yes. They gain access to writs and portals as if they are from the Underdark, but know they also loose access to some surface writs and ferries.