Musketeer aesthetic
Dueling weapons 
Pistols
Magic Punk
Ünterland

Rewrite the rules of Ünterland.
Limbo dangerous, Ünterland less so. Limbo attacks soul, strips powers but safe passage into Ünterland does not.

Jager
Servants of the One
Imbued by the Hosts, identified at birth by the presence of identical birthmarks on the shoulder blades.