This spell is a part of the Crystal Ball spell chain and is found in the Crystal Ball rune stone.
The posteramancer will tell you, with complete confidence and only a slight air of self-satisfaction, that they already knew how this battle was going to go before anyone threw the first punch. This is occasionally an exaggeration. Battle Foresight makes it considerably less of one.
When this spell is cast the posteramancer reaches through Fate into the immediate future of the battlefield, just the next moment and the moment after that, the specific and practical future of the fight currently happening - and pulls that knowledge forward into the present. Fate offers it willingly, as it always does when the request is made with genuine strategic intent. The posteramancer does not keep this knowledge for themselves. That would be both tactically wasteful and deeply out of character. The posteramancer who has seen the future is most useful when everyone around them benefits from that vision.
The knowledge flows to every ally simultaneously. Where an enemy is about to move becomes apparent before they move. What spell is being prepared announces itself before it is cast. The shape of the next attack is visible before it arrives. Every ally gains +4 to React and may make a React check when the enemy attacks, the difficulty depending on what is being attempted, allowing them to respond to incoming threats with the particular confidence of someone who was already expecting exactly this. Additionally each ally receives their Arcana as a bonus to Evasion, Defense, and Spirit for the duration, Fate's foreknowledge translating directly into the ability to be exactly where an attack is not. The posteramancer watches the battle unfold and says nothing. They already knew it would go this way.
Armor Effect: Battle Foresight
Increase React by +1 per piece of armor bearing this rune stone.