If we're counting the wall-building in Terraria and Minecraft, we might consider adding block conjuration in Eldritch. It's much less likely to be a part of any given game of Eldritch than either of the above, and conjuration's at least as often used as a trick for creating climbing steps or rafters for safe passage, but given how cheap the spell is and that enemies can't crouch it's very handy for creating barricades across doorways or (when you have time) through rooms and hallways that you can still easily pass but nothing (too dangerous) can get through or attack you through.
If we're counting the wall-building in Terraria and Minecraft, we might consider adding block conjuration in Eldritch. It's much less likely to be a part of any given game of Eldritch than either of the above, and conjuration's at least as often used as a trick for creating climbing steps or rafters for safe passage, but given how cheap the spell is and that enemies can't crouch it's very handy for creating barricades across doorways or (when you have time) through rooms and hallways that you can still easily pass but nothing (too dangerous) can get through or attack you through.