works for surv and camp (not really a towerkill). You dont even need the mortar for campaign, just makes surv safer.
Swap shrine and healing aura for owl on surv. The healing aura is very optional, just makes it a lot safer during boss.
tb and upper on 1, shoot towards 2.
First batch of secret buttons on 3, final one on 4. Recommended since Hero Cupids don't disable abilities, unlike the Mega Cupids. Overall, the secret is better.