First of all, thank you so much for the ultra speed reply! I remember seeing your profile picture every now and then throughout the years xD very catchy and addictive to look at.
I did pretty much exactly this. But what happens in game is as follows: After level up, Hero shrinks down to 5% of its original size to then gain 5% more size per level. It may work halfway but it always seems to start from that 5% value first after triggering the trigger.
What i did:
-created a variable (type: real) with the initial amount: 100
-created this trigger you posted, except it reads a bit differently: Set VariableSet ScaleSize[100] = (ScaleSize[100] + 5)
Where the 100 is, there it asked for the "Index".
If this is wrong, i don't know where to find the right selection.
Best regards