### Function: StartHeroicOpportunity(caster, class_id)

**Description:**
Start a heroic opportunity with the caster based on the class_id.

**Parameters:**
- `caster` (Spawn) - Spawn object representing `caster`.
- `class_id` (uint8) - Integer value `class_id`.

**Returns:** None.

**Example:**

```lua
-- From Spells/Fighter/FightingChance.lua
function cast(Caster, Target)
    -- Begins a Heroic Opportunity
StartHeroicOpportunity(Caster, 1)
end
```