[Chosen] Tooth of Tzeentch - what's going on?

[warcraft3]

Can someone explain me why should I keep this ability in my rotation while leveling PQs and quests? I can't understand this ability.
I think I am suppososed to use it in dungeon or RvR scenario when group of my allies focus the attack one target together with me?
When I use it I have the buff for short time

Spoiler:

worn off by my auto attack or next ability I guess

but shouldn't the target I used the ability on be afflicted by the debuff? The tooltip says everyone in the group causes additional damage, not just me.

Excuse me if I made the problem too long.

[krumhur]

Can someone explain me why should I keep this ability in my rotation while leveling PQs and quests? I can't understand this ability.
I think I am suppososed to use it in dungeon or RvR scenario when group of my allies focus the attack one target together with me?
When I use it I have the buff for short time

Spoiler:

worn off by my auto attack or next ability I guess

but shouldn't the target I used the ability on be afflicted by the debuff? The tooltip says everyone in the group causes additional damage, not just me.

Excuse me if I made the problem too long.

the kotbs equivalent, Shining Blade, has an added functionality: if you are using an aura from the first spec ("dps" spec), you will deal additional damage (roughly half of what the base skill does) on each skill damage for the next 5 secs. The added functionality triggers, for example, for every hit of the channel ability, adding a decent amount of dmg.

Not saying that it should be mirrored on chosen, just pointing a interesting difference.

[Omegus]

Can someone explain me why should I keep this ability in my rotation while leveling PQs and quests? I can't understand this ability.
I think I am suppososed to use it in dungeon or RvR scenario when group of my allies focus the attack one target together with me?
When I use it I have the buff for short time

Spoiler:

worn off by my auto attack or next ability I guess

but shouldn't the target I used the ability on be afflicted by the debuff? The tooltip says everyone in the group causes additional damage, not just me.

Excuse me if I made the problem too long.

In terms of whether it's worth it, add up the damage the attack does plus the bonus damage it deals and see if the total is higher or lower than other abilities you could use instead.

As for the buff, if you're in a group then when you use Tooth of Tzeentch each person in the group gets that buff applied to them. Then, when they next attack, the buff on them will trigger the bonus damage and then expire. It doesn't matter who your group members attack, they still get the bonus damage provided they attack something within 5 seconds of getting the buff.