A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Since some cards seem to be gaining absent, asking if Unicorn Stronghold has it or no.
The Golden Plains of the Unicorn Battle/Engage: If he would be opposed, move to the current battlefield your target unbowed Personality in a Cavalry unit at any location.
I'm afraid the lack of Absent here is intended. The cards that are gaining Absent are mostly Interrupts that can be played in conjunction with Absent actions, so the Interrupts also needed the keyword to work with them.
You need Presence to use the Unicorn's stronghold ability.