Jin'rokh the Breaker
Tanks have a swap, watch out for the Static Wound debuff and be ready to taunt. Everyone else stand in the pools unless they're electrified, step out and stack near the boss during Lightning Storm. If you're targeted by the Focused Lightning, run away, and don't electrify the pools.
One tank on the boss, the other on adds -- switch after each door so Triple Puncture doesn't stack too high. The adds cast debuffs, so healers be ready to dispel. Stay away from Horridon's head and tail. Kill Dinomancer adds first and stay out of stuff on the ground. Click the Orb of Command when it appears. After the door phase, War-God Jalak will spawn. Off-tank and burn him, continue on the boss.
Council of Elders
Tanks focus on swapping Frost King Malakk before reaching 15 stacks of Frigid Assault. Prioritize killing adds: Loa Spirits and Living Sands. If there are no adds, DPS the empowered boss -- it'll be big and purple. Offing Sul first is usually easiest. Priestess: interrupt Wrath of the Loa, kill spirits. Frost King: stack on the player with Frostbite. Kazra'jin: avoid charges, use damage-reduction cooldowns on Overload. Sul: interrupt Sand Bolt, kill adds, don't stand in Quicksand.