Swain needs nerf

I like Swain but is too OP.

When I make 2 stars Swain no matter what my opponents built.

Also I succeeded to build 6 knights + 6 nobles (2 Vow items, 2 carries). After a long fight 2 stars Swain (with 2 items and 4 imperials bonus) wiped out my team. I know imperials has double damage but 6 nobles + 6 nights is not easy to build.