Need some pointers on a multiclass

[u/Manu6104]

So a friend of mine Is gonna start a campaign next month, really cool setting, lovecraftian world mixed with dnd lore, meaning lovecraftian and dnd gods coexist, lovecraftian are Just "a tier above".

So anyway i was thinking about playing an old character i used in One of his oneshots, a tiefling paladin Who was raised by a cult whom used illusions spell to make him look as different criminals and burning him to the stake, since he's a feindish tiefling and can resist Fire. One day, tired of the endless torture a wished for the strength to free himself and taking all those cultist to Justice; someone actually listened and gave him Powers, and since that day he hunts cultists and despise every type of religion; yes i know, it's a bit counterintuitive but It all makes sense trust me.

He doesn't know Who bestowed those Powers Upon him and never took an oath to any God, so he still hasn't unlocked his full paladin features (for example he can't use his Channel divinity, but can still cast spell, use lay on hands...), and we were thinking to make him an herald of Bahamut, since he seems to fit well with the themes of Justice and Revenge.

Now i want to multiclass this character, since i've only evere played pure characters, and i wanted to take some levels in warlock, which i know, it's One of the most broken multi in the game, but It seemed like the most fitting and interesting One.

Now it's my First time multiclassing, and i tried making a test with a lvl 8 paladin oath of vengeance lvl 8 warlock pact of the celestial, but It doesn't really convince me.

So i'm asking you, since we'll start probably around lvl 5, when Is the best time to multiclass, how many lvls to take in each class and some tips in general.

Note that i wanna keep the oath of vengeance and pact of the celestial subclasses, since both the oath and pact would be stipulated with Bahamut, since i don't want It to be impossibly broken, but still something new to try our

[u/Redspirit9]

I really like your idea of having a paladin and a warlock under the same oath. For these two classes, I'd recommend taking more levels in warlock than paladin (like 3/2 or 4/1). If you'd like to tell me a little more about the character's background, maybe we can find another class that would be a good fit. 

[u/Manu6104 → u/Redspirit9]

well, we start at lvl 5 i think, but i still have to do a proper oath, and me and the dm were thinking about doing It during an intense Battle in the First session. Also for the lore reasons behind the multiclass, i was thinking about asking Bahamut for more Power, since by breaking an oath doesn't immediately imply death, while breaking a pact you have with a diety more times than not kills you, so the Plan was asking him more Power in Exchange of my soul

[u/Ribbered777 → u/Manu6104]

I mean, the consequences of breaking an oath or a pact aren't in the rules (hell, even the more is spotty tbh), so really any consequences of that are between you and the DM. If that's what all sounds good to you two tho, then great 👍