summoning does not require any attribute points and does not scale with attribute points period... only the summoning skill effects it... the most common strategy is to go summoner/necro and use physical damage on your summons along with necromancy.
summoner can be pretty powerful with high summoning but being pure is almost never good now.. especially since certain skills now require investment in multiple combat skills..
so eaither go summoner/necromancer. or choose an element and then specialise in it.. like earth and poison you could use skills to enhance your pet with poison/acid and do that.
