Welcome to Goldceo.There is a 2Moon guide about summoner tank Build .if you are interested in it .just look through.Hopefully the article can help you. I believe you will learn something from it.

1st off best offense is defense.
the pet u choose is all preference.
I chose libido because tarantuala does poison dmg. Which makes lvling fast in the beginning for staffs because the poison stacks.
your build should go 3/2 spirit/health and every 6th lvl 3 strength 1 health and 1 spirit . If you follow this pattern then when you reach the lvl for your next staff which is every six u will be able to weild it.

(Skill tree) my opinion. I like every skill except for summon blades. my suggestion max them except blades and twin slash. ( you can max summon blades l8r when u have extra sp to add for those people who have resistance to poison.

Skin of forgotten realm is very good skill dont listen to the rumors. If you are a pvper its usefull. The skill doesn"t last long but how long do most pvp battles last? your answer Not very long. It adds alot of defense. I have it at lvl 3 right now and it adds like 50 defense not sure exact numbers.

thorns and evolt max them out right away. low mana cost for pve so grinding is good when lvling. also good for pvp but later on that. summon of bats is good for healing and aoe before u get summon of ghosts. good also in pvp my opinion. usually hits enemy 3-4 times and dmg is reasonable. Not a bad skill.

Use poison accesories or magic dmg accessories thats it. forget fire and other elements you're a summoner not a mage.
(only use element stuff to kill bosses)

Grinding- There is no fast way of lvling except for lvling. 5-12 lvl in noob maze
12-34 castor
34-50 nunvince dungeon requies beach
50-60 castor floor 2- when you reach lvl 52 you get summoner of ghost. aggro mobs to gather your mobs around you and use summoner of ghost and bats. when doing this u will be aoeing and healing. faster experience.
60-crespo ( dungeon )although you can go here at 55

pvp-staff can be very good at pvp.

summoners-worthless fights-if higher lvls u will probably lose if they built right-lower lvls you will win

summoner swords-the trick is fight them head on. 1st cast SOFR tap Tilda summons of bats evolt thorn spam those 3. spam all skills if u have more but evolt and thorn have least cool down and least mana usage which can be a life saver if u need to pot hp. you should push the tilda key after every skill. the tilda key is ~ for those who dont know. use bats often and pot. dnt be cheap buy pots to fill up cuz those could be what saves u in any pvp match. I mean use the right amount for your health and mana. not 480 hp when u have 3500 hp make sense of it. you can win because you should be able to outlast them. You should have more hp and defense. If they have high defense then they are probably to weak to kill you.