order:
a.
a society of people who lead a holy life according to a particular set of religiouse rules
如果是膜拜死神的话 可以译为死亡修士会
b.
a group of people who have recieved any of several special honors given by a king, queen.etc. for bravery etc.
但是order of death 是和order of Garter完全不同意义的组织
窃以为还是象条顿骑士团(Ordo Domus Sanctae Mariae Teutonicorum)一样 翻译成死亡骑士团比较好
或者亡者兄弟会