Invisibility Enhanced.
9 combinations with:
No concentration. Till long rest/Permanent.
Picking up, dropping, dragging, lockpicking and disarming does not remove Invisibility
just like looting and opening the door.

Unlock Level Curve support.Use only one main file. Installation

Unmodded spell infoInvisibility is a Level 2 Illusion Spell. This spell allows spellcasters to turn themselves and other creatures  Invisible to the naked eye.

Description
Touch a creature to turn it  Invisible. Attacks against it have   Disadvantage. It attacks with   Advantage.
Invisibility breaks when you fail Stealth Checks on attacking, casting spells, or interacting with items.[See: Bugs]

 Condition ends early if the creature attacks or casts a spell.

Properties
Cost: Action +  Level 2 Spell Slot

Details:
 Range: 1.5 m / 5 ft
 ConcentrationAt higher levels
Upcast: Affects an additional target for each Spell Slot Level above 2nd.

FAQ

Installation/Updating/Uninstallation?
Anytime. This mod leaves nothing in the save.