I noticed some odd behavior with the Halt Undead SLA while running the Delera chain. Specifically, I had to hard-target undead to be allowed to use the SLA. By that I mean soft-targeting was insufficient. This surprised me, as I'm used to soft targets being valid with even non positional spells and abilities (e.g., Command Undead).
Side note: The Halt Undead SLA valid target is listed as "Foe," while the Halt Undead spell lists "Foe, Positional." The SLA behavior sort of matches the description (it's definitely not positional), so I'm not sure if this is a bug with a matching description or simply WAI.