Let's name just a. Few

Archangels : Michael and Gabriel are the archangels who can rival against lucifer. Gabriel though is weaker but he has more speed and attacks on his side. Michael is the second older brother and can make very powerful hits and attacks. Besides he already nearly killed lucifer once.

Lucifers cage : the domain where lucifer is kept during most of the day. It's a domain that after dawn shuts and confines lucifer inside. Though any demon that walks in is automatically stuck as well one things has been able to get through. The snake he calls a pet.

God and Death : both of these entities are very powerful and can destroy or kill lucifer. God might have loved lucifer but after the fall god was unable to look at the archangel the same way ever again. Death though you would think would help lucifer is on no ones side. Death can choose a side but death is able to kill all things around him if so please. He doesn't like the war and stays out of it and does his job.

Archangel blades : the blades that each brother has. They are all powerful enough to weaken or kill a archangel. Lucifer if stabbed many times can die from wounds. Gabriel blade could kill lucifer, michaels blade could injure him badly.

Death seals : if someone can pull of a death seal around lucifer lucifer unfortunately has little chance of surviving such a fates seal. This seal is only know by god and he isn't about to let Michael or any angel have it.