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For tanks or guilds having problems with Heroic Horridon, this guide might be helpful

http://noggenfoggerblog.wordpress.com/2013/06/04/tanking-horridon/

Horridon is the second boss in the Throne of Thunder. He is significantly harder than Jin'rohk the Breaker (at least on 10-man Normal) as the DPS requirements are higher and the execution requirements are far higher. He drops a mount on Normal and Heroic difficulties,  Spawn of Horridon.

Quick LFR Summary: All adds have a higher kill priority than the boss. Dodge Horridon's  Double Swipe as it is one of the only things that can kill players in LFR. Also stay out of  Sand Traps and  Living Poisons and stay away from Frozen Orbs.

Zandalari Dinomancers are the highest kill priority add on every door when they appear because at 50%, they drop an Orb of Control object that a player can click to force Horridon to stop more trolls from spawning from that Tribal Door.

Door 1 (Farraki Tribal Door): Farraki Wastewalkers, Farraki Skirmishers, Sul'lithuz Stonegazers, and a Zandalari Dinomancer

Door 2 (Gurubashi Tribal Door): Gurubashi Bloodlords, Gurubashi Venom Priests who can summon Venomous Effusions, and a Zandalari Dinomancer

Door 3 (Drakkari Tribal Door): Drakkari Frozen Warlords, Risen Drakkari Champions, Risen Drakkari Warriors, and a Zandalari Dinomancer

Door 4 (Amani Tribal Door): Amani'shi Beast Shaman riding Amani Warbears, Amani'shi Flame Casters, Amani'shi Protectors, and a Zandalari Dinomancer

Phase 5: War-God Jalak