This mod supports the 5e Spells mod

You will need the additional file "Warlock - The Undead - 5e Spells Mod Compability" if you want to get access to the new spells.
If the file is not included, your game won't crash, you just won't be able to select the new spells offered by this mod when leveling up.

The Load Order in Baldur's Gate 3 Mod Manager should be:
1. 5eSpells
2.ImprovedUI
3. << OTHER MODS >>
4. WarlockUndead
5.WarlockUndead5eSpells

Finally, here are the new spells available to Warlocks:

CANTRIPS
Booming Blade, Create Bonfire, Frostbite, Green Flame Blade, Lightning Lure, Magic Stone, Prestidigitation, Sword Burst, Thunderclap, Toll the Dead

LEVEL 1
Cause Fear, Unseen Servent

LEVEL 2
Borrowed Knowledge, Flock of Familiars, Mind Spike, Shadow Blade

LEVEL 3
Enemies Abound, Intellect Fortress, Spirit Shroud, Summon Shadowspawn, Thunderstep

LEVEL 4
Charm Monster, Shadow of Moil

LEVEL 5
Far Step, Negative Energy Flood