Use the Totem of Tortolla and the help of a Child of Tortolla to defeat Nemesis. See Garunda Mountainpeak if you lose your turtle companion.
Your turtle companion can use this newfound power to render the two of you invulnerable for a short period of time. You can "turtle up" to avoid the worst of Nemesis and his fury. To do so, simply invoke this totem.
This is all I can do for you. Together, you and a Child of Tortolla must defeat Nemesis, once and for all. Finish the Usurper!
Return to me if you lose your turtle friend.