Dread Warden

You have undergone specialized training in defending others against an undead scourge, keeping them out of harm's way, and protecting them against undead attacks.  This training has granted you insight into ways to hide those you protect from undead and hit them where it hurts most should they find you.  It also gives you insight into their movements and patterns to avoid their tracks and paths before hand.  

You gain the following benefits:

• When you roll damage against an undead creature, you can reroll any roll of 1 on the damage die but you must use the new roll, even if it is another 1.
• When you roll a  Survival check to detect or track undead, you treat any D20 roll of 7 or lower as an 8. 
• You gain the ability to cast Pass without Trace using this feature once per long rest.  You can cast this spell without expending a spell slot. Once you cast this spell in this way, you can’t cast the spell in this way again until you finish a long rest. You can also cast this spell using spell slots if you have of the appropriate level.