[RPG] Is Wild Magic a Prerequisite for a Chaos Sorcerer

Player's Handbook 2 (page 219): Some powers allow you to make secondary (or even tertiary) attacks. A “Hit,” a “Miss,” or an “Effect” entry tells you when to make a secondary attack. Unless otherwise noted, the attack type and the range of a secondary attack are the same as the power’s, and the secondary attack doesn’t require a separate action. Some powers give you the ability to make a secondary attack at a point later in an encounter, after the initial effect takes place. These powers include information about the secondary attack’s action type, attack type, range, and effect

Emphasis is mine. From this text, since Chaos Bolt has the types Arcane, Implement, and Psychic, it follows that any secondary attacks that do not specifically say otherwise are the same.

As one of the types of Chaos Bolt (and therefor its secondary attack) is Implement, he should be entitled to all the benefits of using his implement for the attack, including the standard enhancement bonus to attack and damage. Using the same logic, the secondary attack is also Arcane, so any benefits to arcane powers that have all requisites met should also trigger.

No creature is immune to any kind of damage unless its stat block explicitly says it is.

You can think of psychic damage as interfering with a creature's "nervous system" or whatever magical thing it uses as an equivalent. Even mindless undead have some way of perceiving their environment and then manipulating the various parts of their body to get their body over to it and attack it; psychic damage is essentially high power feedback (like the really loud screech when you get a microphone next to its speaker) on these channels. If something would be better classified as a trap than as a creature, then it's probably immune to psychic damage.

Radiant damage isn't really light so much as it is divine power. It happens to look like light, but it's not; a laser or high-intensity infrared source would do fire damage. Radiant damage is like a flashlight that's been imbued with holy power to accomplish a specific task (namely, destroying some poor creature); the holy power only does what the ability says it does (damage), so powers that do radiant damage can't be used for other purposes unless blinking a bright flashlight briefly could accomplish those same purposes.

A brief discussion of the other damage types:

• acid: read up on how acids work for more, but basically it reacts with the target's physical substance and changes it into something else
• cold: removes (thermal) energy from the target
• fire: adds (thermal) energy to the target
• force: pushes on something without physically touching it (similar to, but not the same as, gravity & magnetism)
• lightning: adds electrons (lots of them) to the target
• necrotic: accelerates decay & the natural entropic breakdown of the target; some creatures might be immune to this if they can normally "live" for billions of years and they're made of something extremely stable, like gold (just because a golem's enchantment will last that long doesn't mean its physical form will)
• poison: causes undesirable chemical reactions inside the target
• thunder: compression wave in whatever medium the target is in; wouldn't work in a vacuum