(Intended for D&D 5e)
Wild Magic Surge:
A halo appears above your head for the duration of 1d10 days. During this duration, you have disadvantage on all Stealth checks.
or...
Your wielded weapon is replaced by a replica made of cheese.
The first result is official or was found online. The second result is one I wrote.
Go to the list of generators
Go to the sorted list of generators