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Does going outside the range of the spell or breaking line of sight between the caster and target break concentration or otherwise affect control over the spell?

For example, a Heat Metal spell has a range of 60 ft. If I cast the Heat Metal spell on a an armored foe, and that foe runs outside the range of the spell (60 ft), or around the corner, does that break concentration and end the spell? Heat Metal also allows you to use a bonus action to cause the 2d8 of damage — would exercising that option be prevented by being out of range or line of sight?

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Player's Handbook p.203

Once a spell is cast, its effects aren’t limited by its range, unless the spell’s description says otherwise.

QED

From your example, Heat Metal says:

Until the spell ends, you can use a bonus action on each of your subsequent turns to cause this damage again.

There is no range or LoS limit on this - they can run but they can't hide! Distance is not a protection and (arguably) even moving to another plane doesn't help.

Given that it takes longer to get out of armour than the spell lasts (1 minute), you had better try to break the spellcaster's concentration. Make no mistake, this is a lethal spell to use on armoured opponents especially since it scales with spell slot.

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    \$\begingroup\$ I think these two answers need to be combined. RAW suggests there's an LOS requirement on p. 203, but its clarified by Efraim's answer below. \$\endgroup\$ – Adam Wells Jul 6 '17 at 15:41
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No. You don’t need to be within line of sight or within range to maintain concentration on a spell, unless a spell’s description or other game feature says otherwise.

The Sage Advice Rules of Spellcasting article on Wizards' site confirms this:

IF YOU’RE CONCENTRATING ON A SPELL, DO YOU NEED TO MAINTAIN LINE OF SIGHT WITH THE SPELL’S TARGET?

You don’t need to be within line of sight or within range to maintain concentration on a spell, unless a spell’s description or other game feature says otherwise.

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