Ancient Enemies Returned I is a rare Weekly Objective for Galactic Seasons in Star Wars the Old Republic.

To complete the Ancient Enemies Returned I objective, you must kill both Keeper Anais on Tatooine and Night Stalker Raxine on Dromund Kaas.

Keeper Anais

Keeper Anais

Keeper Anais spawns on Tatooine in the Jundland Wastes, she is found on the hill between the two large Krayt Dragon skeletons south of Outpost Thorazan and North-West of Outpost Zaroshe.
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Keeper Anais drops 1 Dark Side Token as loot when defeated.

Strategy

Keeper Anais has two mechanics that need to be avoided, she alternates using both of them although they can happen at the same time.

Melee players and tanks need to avoid the Large Yellow/Orange rectangle that covers a large area across the boss themself, when the yellow circle under the boss fully charges up to the edge the entire Large Yellow rectangle will deal massive damage for a few seconds.
This can be hard to see on Tatooine and Hoth due to blending into the ground, as it has been pictured above.

All players both melee and ranged need to be careful for Light Blue Lightning circles. Every 30 seconds light blue circles will spawn under 12 random players, you will only have 5 seconds to move before several lightning bolts strike every circle.
Getting hit by one lightning circle will not kill you, getting hit by two or multiple at the same time will.
This can be hard to see on Hoth due to blending into the snow.

Night Stalker Raxine

Night Stalker Raxine

Night Stalker Raxine spawns on Dromund Kaas in the jungle near the main road South of Kaas City. She is found near a pond that is overlooked by a bridge.
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Night Stalker Raxine drops 1 Light side token when killed.

Strategy

Night Stalker Raxine has two mechanics that need to be avoided, she alternates using both of them although they can happen at the same time.

Every minute or so Night Stalker Raxine will apply a poison DOT to your character, you either need to cleanse it yourself, have a healer cleanse you or use a medpac to survive it.
Tank players should take priority when being cleansed, if you are a DPS player and the boss has a high amount of HP it may be easier to die, respawn and run back to the boss.

All players both melee and ranged need to be careful for the White Lightning AOE circles. Every 30 seconds light white circles will spawn under random players, you will only have 5 seconds to move before bright purple lightning activates in the circle, making part of the floor around the boss deal damage if you stand on it.
This can be hard to see on Hoth due to blending into the snow.