Summoner is supposed to get more powerful in the endgame.. more powerful demon summons other than just the incarnate.. probably in act 2+ well have more powerful summoning abilities.
When you have 10 in summoning skill in the Alpha version you can already see the big demon version of the incarnate.
He is bugged and his damage are the same as level one but you can see his imposing face and big HP pool.
He's ability damage scale well however.
