Forum:Trap Eater

If my opponent has a face up Royal Oppression and a face up Thunder King Rai-Oh, can I special summon Trap Eater to the field? Or can my opponent chain with Thunder King Rai-Oh?

What kind of special summon can and can't Thunder King Rai-Oh negate? Can Royal Oppression negate all special summons regardless if it's by spell/trap/effects?