Hey everyone I thought I might put it out there for you, since Robinson is still super hard. He's actually really easy to kill if you get the right people. Here I will outline a few ways to kill it. The basic level I'm stating is around 60 each. Oh and remember a few added people to each strategy doesn't hurt.

1.

Required Party Members: Guardian Swordsman, 3 Priests, 2 Gladiators
2nd Party: 1 Priest, 2 Gladiator, Court Magician, 2 Excavators/Snipers

This is the most basic strategy that most people use. First The Guardian Swordsman will activate Absolute Defence and tank it. Then the Gladiators will do the damage with the GS. The Priests will run in and heal/cure when needed. The 2nd party will then be on Mob Control. They will kill ALL Mobs attacking the main party. This process will continue until Robinson is dead.

2.

Required Party Members: 2 Gladiator/Guardian Swordsman, 1 Priest, 3 Excavators/Snipers

This is a much harder strategy suited for a High Level Priest and strong Dmg Dealers. The Excavators/Snipers should also have a lot of stun moves. The Gladiators/Guardian Swordsmen should also have a lot of knock-back/stun skills. It will start off with the Gladiators getting the aggro. Then they will split apart and then switch the aggro between them. The one with the aggro should use as many knock-back skills as possible. When he is getting weak the other Gladiator should take the aggro. Then the one with the aggro before should sit down. The 2 Excavators should then use as many stun skills as possible killing mobs when necessary. Then the Priest should be saved for healing when needed. When the Priest goes and heals the Excavator not doing anything should stun Robinson when the Priest goes into heal.

NOTE: Do not attempt this with Str Gladiators. If they don't have any Con then Guardian Swordsmen should take their place.
The 2 GS/Gladiators should also be out of each other's aggro range. So when one has Robinson on him the other should not be within that vicinity.