Most eldritch invocations are permanently active. For instance: the Agonizing Blast invocation works every time you cast the eldritch blast cantrip; there's nothing for you to do or say. It's already in effect. Another example: Devil's Sight. It's permanent; you can see in magical and nonmagical darkness at all times, no casting or invoking needed.
Some invocations are actual spells that require casting, and some may require a spell slot. For example: the Chains of Carceri invocation allows the warlock to cast hold monster without using a slot....but it still requires you to use an action to cast the spell. The Dreadful Word invocation allows the warlock to cast confusion as additional spell but it takes a spell slot to do so. So again: it requires an action to do.
You'll need to read each invocation to see if it's an "always in effect" result or requires an action to cast a spell.
If you take an Eldritch Invocation that says "You can cast X", you gain the ability to cast it just as you would cast any other spell. The Invocation will specify any changes to the normal casting rules for the spell(if certain components aren't required, if you need to use a spell slot, how many times a day you can cast it, etc).
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Do I need to do a ritual or do I just cast it?
Most eldritch invocations are permanently active. For instance: the Agonizing Blast invocation works every time you cast the eldritch blast cantrip; there's nothing for you to do or say. It's already in effect. Another example: Devil's Sight. It's permanent; you can see in magical and nonmagical darkness at all times, no casting or invoking needed.
Some invocations are actual spells that require casting, and some may require a spell slot. For example: the Chains of Carceri invocation allows the warlock to cast hold monster without using a slot....but it still requires you to use an action to cast the spell. The Dreadful Word invocation allows the warlock to cast confusion as additional spell but it takes a spell slot to do so. So again: it requires an action to do.
You'll need to read each invocation to see if it's an "always in effect" result or requires an action to cast a spell.
If you take an Eldritch Invocation that says "You can cast X", you gain the ability to cast it just as you would cast any other spell. The Invocation will specify any changes to the normal casting rules for the spell(if certain components aren't required, if you need to use a spell slot, how many times a day you can cast it, etc).