As this is final of your campagin why do you want to make it easy? Even if most of players characters die in this final fight this will only make it more heroic. If you make it easy your players will kill it in 4 rounds and well..another average adventure finished
As AaronOfBarbaria notes, as DM, you can allow whatever you want to allow to happen. I suspect, however, that you are asking a question of plausibility, which may be where BirdCopp is heading. That too is up to you, but you can increase plausibility if, in your game world, you have set at what level divine intervention happens, and what kind of divine intervention that might be.
For example, in some worlds, the gods keep to themselves unless it's an apocalypse level event or someone asks real nice (see The Silmarillion) In other worlds, the gods may be micro-managers. Or they could senior management, and leave day-to-day running to lesser beings.
The use and role of angels depends upon how active the divinities are. The angels could be only brought out when it's that bad. Or they could be mainly passive observers, giving only vague advice if they were to help at all. Or, they could middle management, acting as conduits of the divine will. Or they could be foot soldiers, and mortals are simply in the way.
As Aaron says, it's totally up to you as the DM - you could have a side quest where the party earn the favour of an angel, so that it's not a surprise if/when it comes to help them. You could even have the angel tell them that they can call upon it for help one time, then it's in the hands of the players if they call for help - you can always tailor the stats of the angel to give them the appropriate amount of help they need.
So your setup could be along the lines of the following: Players have to battle through the lichs hordes of undead minions (zombies, ghouls etc) - they are weak but there's a lot of them and they have turn resistance because reasons secret magic lich ritual powers
The lich could have a Deva or Solar imprisoned in an adamantine, warded cage and is using it to fuel the ritual. While the lich is chanting away it's legion of undead are mobbing the players slowing them down.
If the players can free (or kill?) the angel it might disrupt the ritual. By freeing the weakened angel, it can use it's super turn undead (that overcomes secret magic lich ritual powers)to stop the minions and then heal the players so they can finally take on the Lich in a fair(ish) fight.
My final boss battle will be a lich trying to create a dracolich. Is this enough to make Angels appear (possibly to help the players if they do bad)
You are the DM, so it's your decision if that is or isn't enough for whatever kind of creature to take direct interest.
Are there angels in your setting at all?
As this is final of your campagin why do you want to make it easy? Even if most of players characters die in this final fight this will only make it more heroic. If you make it easy your players will kill it in 4 rounds and well..another average adventure finished
As AaronOfBarbaria notes, as DM, you can allow whatever you want to allow to happen.
I suspect, however, that you are asking a question of plausibility, which may be where BirdCopp is heading. That too is up to you, but you can increase plausibility if, in your game world, you have set at what level divine intervention happens, and what kind of divine intervention that might be.
For example, in some worlds, the gods keep to themselves unless it's an apocalypse level event or someone asks real nice (see The Silmarillion)
In other worlds, the gods may be micro-managers. Or they could senior management, and leave day-to-day running to lesser beings.
The use and role of angels depends upon how active the divinities are. The angels could be only brought out when it's that bad. Or they could be mainly passive observers, giving only vague advice if they were to help at all. Or, they could middle management, acting as conduits of the divine will. Or they could be foot soldiers, and mortals are simply in the way.
These things are up to you, more or less.
There is a section in the monster manual about angels: Planetar / Solar / Deva
As Aaron says, it's totally up to you as the DM - you could have a side quest where the party earn the favour of an angel, so that it's not a surprise if/when it comes to help them. You could even have the angel tell them that they can call upon it for help one time, then it's in the hands of the players if they call for help - you can always tailor the stats of the angel to give them the appropriate amount of help they need.
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So your setup could be along the lines of the following: Players have to battle through the lichs hordes of undead minions (zombies, ghouls etc) - they are weak but there's a lot of them and they have turn resistance because
reasonssecret magic lich ritual powersThe lich could have a Deva or Solar imprisoned in an adamantine, warded cage and is using it to fuel the ritual. While the lich is chanting away it's legion of undead are mobbing the players slowing them down.
If the players can free (or kill?) the angel it might disrupt the ritual. By freeing the weakened angel, it can use it's super turn undead (that overcomes secret magic lich ritual powers)to stop the minions and then heal the players so they can finally take on the Lich in a fair(ish) fight.
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The side quest is a good idea. I’ll think about it.
This is also a good idea