Tuchanka

Tuchanka is definitely worth visiting, primarily for the two loyalty missions that take place there. This krogan-run world does not take too kindly to other races, as evidenced by the unfriendly greeting upon landing on Tuchanka. They tell you to take it up with their clan leader.

Entering the disheveled city, you find more evidence of prejudice when a great majority of its denizens snub you. All except a local shopkeeper by the name of Ratch, who is a smart businessmen and is perhaps one of the few in Tuchanka who won't discriminate, utters more than just a few curt words. The jingle of your credit-filled pockets is like music to Ratch's ears. He drives a hard bargain, though. Unlike many of the other shopkeepers you've spoken to before, you must wrest the discount from him by first completing a small favor. He's got a pesky problem with some pyjaks and wouldn't mind a little extermination. See the side quest for further details. The other storeowner at Fortack's Database sells significant weapon upgrades--rather his kiosk does--but at steep prices. If you're wondering, there is no discount to be had from him. Still, that isn't to say that you should totally dismiss making a thought-out investment.

The krogans amuse themselves with varren pit fights, as you'll find a pit somewhat in the middle of the town. You can wager credits on your favorite varren at the kiosk next to the fighting pit. Each bet costs you 100 credits, but the rate of return for winning is not bad. There's not much else to do in this rubble-filled environment aside from the aforementioned points of interest and paying a visit to the clan leader.

Urdnot Wreav (or Urdnot Wrex) sits on his throne overlooking the varren pit. His bodyguard appraises you with a piercing gaze before Wreav speaks. You can proceed to ask him about any number of things, including Mordin's intel on a salarian captive, which funnels you toward Mordin's loyalty mission. Similarly, for Grunt's loyalty mission you need to bring the confused krogan before Wreav to catalyze the mission's start.

We'll start with Mordin's mission.