The order you slot it is totally personal preference, just make sure you aim to get all of these skills.
Pierce Armor: Puncture morph. Weapons section, One Hand and Shield tree. Your melee taunt, every tank must use it.
Lotus Fan: Teleport Strike morph. Class section, Assassination tree. A great gap closer and also will inflict Major Vulnerability, which is a great pre-debuff to apply to a boss.
Inner Rage: Inner Fire morph. Guild section, Undaunted tree. Your ranged taunt, that will also activate a synergy for your group.
Mirage: Blur Morph. Class section, Assassination tree. This is a great mitigation skill, always have it active during a fight.
Leeching Strikes: Siphoning Strikes morph. Class section, Siphoning tree. This will help you heal and sustain your stamina, always have it active too.
Soul Tether (Ultimate): Soul Shred morph. Class section, Siphoning tree. Awesome ultimate that heals you, heal your allies, and also damage enemies.
Combat Prayer: Blessing of Protection morph. Weapon section, Restoration Staff tree. This will help your teammates have more mitigation. Mirage is your mitigation, and Combat Prayer is your allies mitigation, and on top of that, this skill also buffs their damage done.
Healing Springs: Grand Healing morph. Weapon section, Restoration Staff tree. This is a great healing ability, and that will tie in very well with our restoration staff we are using, helping you and your team to sustain better.
Silver Leash: Silver Bolts morph. Guild section, Fighters Guild tree. This will pull the enemies close to you, a great skill to group enemies.
Refreshing Path: Path of Darkness morph. Class section, Shadow tree. This is going to increase the moving speed and heal everyone in the area, this is great to escape crowd control and AoE damage.
Sap Essence: Drain Power morph. Class section, Siphoning tree. This is an awesome skill that will heal you and your team the more enemies there are, and will increase your spell and weapon damage against those enemies.
Bolstering Darkness (Ultimate): Consuming Darkness morph. Class section, Shadow tree. A really fun to use and really strong ult. It will slow every enemy in the area and also heal every ally by a lot.
Class: All Assassination passives. All Shadow skills. All Siphoning skills.
Weapon: All One Hand and Shield passive. All Restoration Staff passives.
Guild: All Undaunted passives. Slayer, Banish the Wicked and Skilled Tracker from Fighters Guild.
Armor: All Heavy Armor passives. All Medium Armor passives, minus Improved Sneak.
Racial: All Dark Elf passives.
Craft: Medicinal Use from the Alchemy tree.