How to beat Sedna with current event

[Seanrhys]

Since there is an even going on at the moment, I can't do the boss battle again Kela De Thaym since it is asking me for 100 judgement points, and I just want to do the boss battle and get to Uranus. I'm not really sure how to get by this, or if I have to wait for the event to be over to do it

[derp215]

The boss fight and judgement points are permanent additions to the game, so you have to do Rathuum in order to beat Sedna.

[UnderFiend]

Derp215 is correct but thankfully, the point rewards got increased so once you work your way from the first event arena, you'll be able to get up to the 25 point third-tier in a relatively quick period of time.

I'd suggest just running the event since it's here for another day, and a lot of players find it fun. If you're scared of failing, just be careful and go in a team. I've never been in an arena fight that was lost.

http://warframe.wikia.com/wiki/Operation:_Rathuum