Whenever one of your other Characters is attacked, the attacking unit gets -1 power and Onar gets +2 power until end of battle.
As long as Onar is being attacked, Intercept and Redirect abilities can't be activated.
Keywords
Intercept
Intercept: A selective ability activated during the attack POP that means, "If one of your other units is being attacked in the same arena, the attacking unit now attacks this unit instead." Intercept doesn't end the attack. Any number of units may intercept an attack once for each instance of the effect. Each intercepting unit has been attacked. Intercept isn’t a prevention ability. Intercept doesn’t cause a new attack. (It is the same attack.) Your unit may intercept an attack from one of your own units (but not from itself) as long as that unit can attack it. If it can't attack the intercepting unit, you can pay its activation, but the defending unit won’t change. "For this attack" effects do not trigger for each intercept. Some effects may end because they don't apply to the new defending unit unless the effect's conditions are met by the new defending unit. An effect that addresses the attack can't be played for each intercept, but could continue.
Redirect
Redirect: An activated ability that means, "If this unit is attacked, choose one of your other units that can be attacked and damaged in this arena. The attacking unit attacks the chosen unit instead." Precision will cut through Redirect just as it cuts through Intercept. However, there are cards that can cause a unit to lose Precision, or part of its game text.