Heads will roll; there will be blood.

Marie Avgeropoulos characterization of The CWs post-apocalyptic drama is a perfectly apt description of the third season in particular.

When the show returns for season 3, viewers will see the characters after a three-month time jump.

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Credit: Cate Cameron/The CW

Youll see that a little bit before everything turns to s.

War came before, and its coming again.

But thesourceof that conflict is the big question.

about which of these two threats we should be worried about going into this new season.

First up is the Grounder conflict.

So shouldnt the Grounders be praising the Arkers?

Larkin echoes this sentiment, saying theres a fine line in the Grounder/Arker relationship.

In season 2, the two groups were able to work together because they had a common enemy.

Now that that common enemy is gone, were left to deal with that relationship again, Larkin says.

Or put more simply by Bostick: Theyve gone from enemies to frenemies.

Although we weretechnicallyintroduced to them in season 2, we know very little.

Out of the 12 Grounder clans, Ice Nation is easily the most terrifying, Larkin says.

If youve been horrified by any of the Grounders before, you havent seen anything yet.

She compares Queen Nia, played by newcomer Brenda Strong, to Clarke in some ways.

They [both] do whatever they have to for their people.

And thats when things start getting political which Harmon says is his favorite part of season 3.

You definitely see the juxtaposition between the Ark politics and Grounder politics, he says.

Their [politics are] very different … but the end result is seemingly the same.

Thats pretty terrifying, Larkin says.

I cant see that ending well.

stories connect will be a big reveal.

So maybe the answer to our original question Where does the season 3 war come from?

is all of the above?

Either way, there definitely will be blood.

The 100returns on Thursday, Jan. 21 at 9 p.m.

ET on The CW.

Additional reporting by Natalie Abrams