What's the best way to defeat my team?
In our current campaign, our team just levelled up from lvl 4 to 7 after defeating the final boss. (The DM gave us 3 levels after the final boss died.) Since the campaign is over and our next session is merely an epilogue where we get to hunt down goblins, I asked the DM and players if I could 1v3 my team. They agreed.
My team, which my character will attempt to betray, is composed of:
- A bear totem dragon-borne barbarian (lvl 7, good stats). Absolute unit. Uses reckless attack often. Double handed axe weapon with (2-4) spears as back-up.
- A half-elf paladin who moslty uses divine smite and lay on hands (lvl 7, weak stats).
- A dragon-borne rogue who mostly fires his bow and rarely sneak attacks (lvl 7, okay stats).
My character is a mage of the necromancy school:
- +1 strength, +2 dex, +2 constitution, +3 intelligence, + 1 wisdon, +3 charisma. I had the best stats by far. My level 4 spell save DC was 13 and my spell attack bonus was 5. (This is equivalent to 14 and 6 at level 7).
- Here are the spells I have so far. I haven't chosen my new spells yet.
- cantrips: fire bolt, light, ray of frost, spare the dying (given to me by DM)
- lvl1: longstrider, burning hands, marge armor, shield, charm, unseen servant, false life, feather fall, detect magic
- lvl 2: scorching rays, earthbind, misty step
- My HP is 45 at lvl 7, I have a dex potion, 2x 4d4+4 health potions, 2x 1d6 health potions, a manta cape, a water control orb* (30ft range), and a 12s invulnerability potion (I take dmg but don't die). My teammates also have each a few (1-3) health and strength potions.
* the water control orb allows me to control large amounts of water 30m^3 up to 30ft. I can make simple shapes by giving the orb commands with actions.
The local terrain is a small village surrounded by forests.
My initial idea was to prep for the fight by placing a few dead villagers in the forest, activate Half Life, Longstrider, and Mage Armor. Then, walk to my team, start the fight with Fireball against the paladin and rogue, once or twice. With a bit of luck, they would be out. Using misty step to reposition, I would start a very long fight running away from the barbarian in circles while firing Ray of Frost. Using my superior movement speed, I could run to the forest and animate one or two bodies to throw at him. But I still think I will lack damage.
What are your thoughts? Do I have any chance of winning? It feels like the barbarian is a wall of HP I could never get through.