D.E.H.T.A. (Druids for the Ethical and Humane Treatment of Animals) is an offshoot of the Cenarion Expedition. They exist as a direct opposite to Hemet Nesingwary and seek to thwart his hunting anywhere they find it. They are opposed to the destruction of wildlife in Northrend areas caused by Nesingwary and his hunters.
As a result of this protection, should you kill any animals in Borean Tundra, including aggressive beasts, you will be given the debuff Animal Blood. This debuff will cause any and all D.E.H.T.A. NPCs to be hostile towards you during the time of the debuff. Should you enter an area where there are D.E.H.T.A. NPCs, they will attack and pursue you. However, you have two options if you have this debuff to remove it. You can either wait it out or remove it by entering a body of water.
There is a series of quests available in Borean Tundra for D.E.H.T.A. that grants reputation with the Cenarion Expedition. On completion of one of the quests, an additional repeatable quest will unlock, allowing for gaining reputation through Exalted with this faction.
Once the above quest chains are complete, you can move on the final boss in the quest chains, Harold Lane.
Returning to the D.E.H.T.A. encampment after killing Harold, you will be able to choose from one of the following rewards:
Once all the quests are completed in this series, the following achievement is granted to the player:
D.E.H.T.A's Little P.I.T.A. (10 Achievement points) - awarded for completing all the quest series.