You may play numerical Hero cards or Non-Wound cards as 1 ALL cards.
You can play numerical Wound cards.
You must count the number of squares between the heroes. You use the square that the active hero was on, at the beginning of the current action.
You count the squares that constitutes the shortest path between the heroes. You ignore other figures (enemies, other heroes, chests, etc etc) when you count this.
You substract the numbers of squares from the total aid.
The hero that is aiding, must aid with 0 or more.
Several heroes can help one other hero at the same time.
Observe that only Wound cards that are numerical can be used in aid.
Heroes can aid after they have done their own turn.
You dont need to have LoS between the heroes.
Heroes on the Rest spoke can not aid anyone.
Observe that the hero Tyra in general cannot receive aid.
W10 "Cracked Skull" counts as a numeric card. The hero that is aiding someone, gets the fatigue.