Guild Wars 2

No. There is no chest as such, but you get a personal letter of commendation with which you can choose a single Rare reward.

you also get like 3 masterworks

The letter of recommendation is for your guild to gain influence. You do get:
Level-dependent XP (though you are likely level80)
One of the following: 2x Flame Ram Blueprints, 2x Ballista Blueprints, Alpha Siege Golem Blueprints (used to build siege weapons in WvWvW)
Letter of Commendation (1000 influence for your guild)
3 Loot Bags (3 random pieces of green gear)
Pact Victory Token (you can trade this at a special vendor for a rare weapon with a specifick unique skin and theme: http://wiki.guildwars2.com/wiki/Pact_weapons )

Ahh its the victory token, I was getting confuuzed.

TY for the correction.

Do map completion of the Orr maps and pretend it’s your reward, as you’ll get two exotics for each one.

It would be nice if the pact weapons were exotics instead of rares. It would be a fitting reward for completing the personal story. Since the update on world bosses, the pact weapons does not seem valuable except for their skins.