The Tau Ceti Foreign Legion (#5779)

This pr adds the Tau Ceti Foreign Legion, at the request of the lore team, to replace/be an alternative to the ert.

code/modules/ghosttrap/trap.dm

@@ -402,6 +402,18 @@ datum/ghosttrap/pai/transfer_personality(var/mob/candidate, var/mob/living/silic
 /datum/ghosttrap/vampire/welcome_candidate(var/mob/target)
 	return 0
 
+/datum/ghosttrap/legion
+	object = "Tau Ceti Foreign Legion"
+	pref_check = MODE_LEGION
+	ghost_trap_message = "They are occupying a Tau Ceti Foreign Legion volunteer."
+	ghost_trap_role = "Tau Ceti Foreign Legion"
+	ban_checks = list(MODE_LEGION)
+	can_set_own_name = FALSE
+	list_as_special_role = FALSE
+
+/datum/ghosttrap/legion/welcome_candidate(var/mob/target)
+	return 0
+
 /datum/ghosttrap/special
 	object = "Special"
 	pref_check = null