Spend 20 and choose an opponent: Add that Hero's Defence to your Defence, this round. Use once per round.
Kevan
Psychic Shield
Burn X: Add 3X to Defense for this round.
Nev the Deranged
Call for Backup
Every other round, you can call for either a bombing run (Attack each opponent for 20 as if by another Hero) or infantry support (create a 5 Energy Sidekick for your Hero).
Ultimatum
Spirit Link
Choose a character during the Allocation Phase. The target's Defense is doubled, and any damage taken by either linked character is transferred to the other. If either linked character is killed during this round, the other must Burn 10 Energy or die.