Go for physical mitigation virtues. After that, max +health ones. You can easily cap tactical mitigation without virtues, and creeps don`t have too manty dangerous tactical attacks to begin with. Stack vitality - 8k HP is definitely not enough.
As far as armor goes - get 2 hytbold animal-friend and 4 moors for audacity (I`d go with storm-caller). Don`t neglect finesse - it`s about the only thing that really matters when you`re grouping as a support.
From The Keeper of Animals you`ll need at least Healer and Dúnadan-learning. Sometimes in group you`ll need to swap one of them to Light of Hope or Proof against All Ills, so get those too. Master of Nature's Fury and The Ancient Master - get all traits there, esp. capstones... OK, you can skip Awareness of Body and The Study of Wind-lore if you really need to - but better not. Make a habit of swapping your traits constantly, depending on where you are going and what you are going to face there.
Don't join dangerous cults: Practice safe sects!