If a level is set, such as you suggest, then all that will happen is the account will grow to 1 level above the set level.
Maybe, just maybe, one way would be to have ruin remain based upon the size of the two accounts and the difference, with 24h being a maximum and 1h being a minimum with a random amount minutes added too. Even this suggestion can be worked around with one small account or player base killing another near the poi.
This could be applied to the killing of the forgotten too so at the start of server a level 14 eventually killing a level 21 forgotten base generates a ruin only in relation to the two bases. It could ignore the fact that the killing base is smaller and treat it in the same way with a max of 24h and a min of 1h plus a small random number of minutes.
