There should be more bosses that actually have to be summoned

It‘d be really nice to have some more bosses that you have to summon by hand (similar to the Wither or bosses in Terraria) instead of them kinda just existing. Together with that it‘d also be great to have a bit more complex summoning „rituals“ for these bosses instead of just collecting two different things like for the Wither, i think Terraria gives many options for inspirations here