Defense Node, also known as Defender is an enemy from Final Fantasy IV that appears alongside CPU and Attack Node in the Tower of Babil. It will heal the CPU for 3,000 HP, severely hampering the party's efforts to defeat it.
The CPU uses Globe199 twice when both the Defense and Attack Nodes are taken out, killing two party members. The Defense Node heals the CPU, so take it out first.
Turn 1 - Restore - Target recovers approximately 3000 HP - always targets CPU whenever possible.