Hi - How do you know who gets which upgrade cards? Is there an order? I know some of them are specific but the one we're curious about it the ignore line of sight. Any input appreciated.

Thank you!

If you are asking which player gets which upgrade cards when playing a two player game with just the core set; each player get the upgrades specific to their faction and the neutral cards are shuffled and dealt out.

If you are asking which units can take which upgrade cards; on the formation card there are icons for which upgrade slots a unit has at each side. They can equip one upgrade for each matching icon on the formation card. The upgrade has to be neutral or of the matching faction. If the upgrade has a symbol on it denoting a unit type (siege, cavalry, or infantry) then it can only be included in a unit of the same type.

RRG, pg. 3:
"For a standard game of Runewars: The Miniatures Game, each player builds an army using his collection of figures, trays, and cards. However, if players only have a single core set, they share components. Due to the component limitations of a single core set, they must choose one player to receive all the Daqan Lords components and another player to receive all the Waiqar the Undying components. Then, all the remaining upgrade cards are shuffled and dealt randomly to the players. For this game, players will build smaller armies and play on a smaller play surface than a standard game. These rules are described in the “Skirmish Rules” section on page 21 of this document."

RRG, pg 20:
"Upgrade cards are equipped to units when a player
is building an army before the game begins. For
each upgrade icon in a unit’s costing table for its
corresponding configuration, that unit can equip
one upgrade card that has a matching icon.
88.1 Upgrade cards grant additional effects to the
units that have them equipped.
88.2 Equipped upgrade cards are placed next to the unit card to
which they are equipped.
88.3 If a unit’s upgrade card is discarded, it is flipped facedown
and is no longer counted toward its owner’s score.
88.4 If an upgrade effect uses the term “you,” it refers to the unit
to which that upgrade is equipped.
88.5 Upgrade cards are readied when the unit performs a rally
action or spends an inspiration token.
88.6 Upgrade cards that have a unit-type icon can only be
equipped to a unit matching that type.
88.7 Upgrade cards that have a faction icon can only be equipped
in armies of that faction"