How Assault Works in Riftbound — Rules & FAQ

Assault X gives a unit +X Might while it's attacking. If no number is listed, X is 1.

Section 807 — 11 rules

What is Assault in Riftbound?

Assault is a Passive Ability keyword. It is functionally short for "While I am an attacker, I have +X [M]."

807.1.: Assault is a Passive Ability keyword.
807.1.a.: It is present on Units.
807.1.b.: Assault is formatted as "Assault [X]".
807.1.b.1.: The X is referenced in the functional text of the ability.
807.1.b.2.: The X is referred to as the Assault Value.
807.1.b.3.: If X is omitted, it is presumed to be 1.
807.1.c.: It is functionally short for "While I am an attacker, I have +X [M]."
807.1.d.: Being an attacker means the Unit has gained the Attacker designation during Combat. See rule 459. Combat for more information.
807.1.d.1.: Assault remains in effect as long as the Unit maintains the Attacker designation.
807.2.: If a Unit has Assault or has been granted Assault and is granted Assault by an additional source, the Assault Value of all granted Assault keywords is summed. Example: Petty Officer has Assault. It is chosen as the target of Cleave, which says "Give a unit [Assault 3] this turn." After Cleave resolves, Petty Officer has Assault 4 this turn.
807.3.: Assault, and whether or not a unit has Assault, is a characteristic of the Unit and may be checked or referenced by other Game Effects.

No. Svellsongur only copies the text that's actually printed on the unit. Copies take on original traits without regard to subsequent alterations.