.spawn [mobID] 0 = spawns normal
.spawn [mobID] 1 = spawns champion
.spawn [mobID] 2 = not sure

.spawn [mobID] 3 = spawns unique
.spawn [mobID] 4 = spawns giant
.spawn [mobID] 5 = spawns titan
.spawn [mobID] 6 = spawns elite
edit: just realised that wasn't the question, well obviously a titan mob is something between a giant and an elite.. xD