In the Explorers Guide to Wildemount there are two new arcane traditions: Graviturgy and Chronurgy. When you’re a Graviturgist at second level you get a magic feature called Adjust Density:
As an action, you can magically alter the weight of one object or creature you can see within 30 feet of you. The object or creature must be Large or smaller. The target’s weight is halved or doubled for up to 1 minute or until your concentration ends (as if you were concentrating on a spell).
While the weight of a creature is halved by this effect, the creature’s speed increases by 10 feet, it can jump twice as far as normal, and it has disadvantage on Strength checks and Strength saving throws. While the weight of a creature is doubled by this effect, the creature’s speed is reduced by 10 feet, and it has advantage on Strength checks and Strength saving throws. (EGW p.185)
I’m still pretty new to D&D and its rules and this made me confused. It’s a variant of the Enlarge/Reduce spell but it doesn’t require any spell slots or a saving throw to prevent it from affecting an unwilling target.
I’m new to being a DM and I’m not sure how OP something like this would be at second level. It could completely turn combats on their head if they use Adjust Density against an attacker whos attacks are based on strength.
I have two questions about this magic feature: Is this OP compared to other second level abilities and what can I do to prevent battles being turned on their head with this magic feature?