Bonuses?

I know that if you have all the games on one account, you could get that Dervish robot thing. But what other bonuses are there from having all the games?

And what are all the bonuses in GWs? o_O

You can obtain the black moa chick.

PS: It's a golem .

you can get a black moa chick buy doing a cross campaign scavenger hunt.

MOX was added recently as a bonus to people who had purchased all games, and as well as being an extra hero, gave a quest with some nice rewards, if you've reached a certain point in each of the three full games.

The Igneous Summoning Stone was added at the same time as MOX to give a boost to players below lvl 20. It summons a Fire Imp ally.

Anything else would be features build into the games like being able to use skills/heroes/characters from one game in one of the others and moving characters freely around games linked on the same account. For instance, factions and nightfall have campaign specific professions not available unless you own those campaigns.

You shouldn't really need any more freebies than that to help you along, as the challenge of the game is discovering the many different ways to beat it. Prophecies for instance was much more challenging before heroes were added as henchmen were typcially a couple of levels lower than the enemies you faced. Try playing that way if you like the challenge.

If you need help, ask questions or look on wiki. wiki is your friend.
http://wiki.guildwars.com

MOX
http://wiki.guildwars.com/wiki/MOX

Zinn's Task
http://wiki.guildwars.com/wiki/Zinn%27s_Task

Igneous Summoning Stone
http://wiki.guildwars.com/wiki/Igneous_Summoning_Stone

U get access to all the legendary titles bar master of the north. Cant get legendary skill hunter wihtout all campaings.

along with a fuller storyline, more diverse farming, SKILLS, full range of heroes, SKILLS, and in 1 way more peeps are likely to pug with you if you are flexable, events are different in different places, and if u get/ have eotn u also have the hall of monuments, where u store perks for GW2.