A Vamp DPS build works well:http://www.allodsbase.com/calc#a70xuc8f ... 4dl5r4o7jg
You can swap out r3 Decay for r3 Fear, if you don't mind respeccing later on (you might respec to heals or acid later on anyway, so who knows) and then take the Panic Monger path to Poisoned Blood instead of Frightful Presence.
Frightful Presence is useful as well, but I'm not sure how useful it is for leveling (I haven't leveled a Summoner in a long time). You may also choose to pick up the r3 ruby for Panic Monger (instead of r2 which is necessary for poisoned blood) or get r2 Blood Tap instead of r1, but it's up to you. Res is also fairly useful for leveling, I went without it, but again, it's up to you.
Alcopop - Level 51 Summoner - Empire - Nezeb
Aesthetica - Level 41 Warden - Empire - Nezeb
Symposium - Level 2x Bard - Empire - Nezeb