You will need:
I will need 4 blood shards if you wish Agamaggan's strength, <race>.
Your foes will cower before your strength were you to be given this blessing. <snort>
The Razormane's greatest warriors are infused with such power!
You will receive the Agamaggan's Strength buff: +10 Strength for 30 minutes.
If only Mangletooth were free to see you decimate those who betrayed him! <snort>
I thank you for destroying more of the Bristleback by gathering these shards. Please, continue to do so, and I will continue to aid you. <snort>