To obtain 23. The Lance side quest in Trinity Trigger, speak with Glaive in his house after completing 22. The Bowsong quest. For this quest, you’ll need to find 5 Jewel Fragments in the Lance. Make your way over to the Lance, which is north of Hoplard, then head on up to the top level via the teleporter.
Once you arrive, you’ll notice that a new way is now opened on the eastern side. Head into this unexplored area then defeat the scorpions. All but one can be found on F6. The last one is on F7. Once you defeat the last one, you’ll be telported out of the dungeon.
Make your way to Stahl and speak with Lime at the Verte Workshop. Afterwards, return to F7 of the Lance to open the sealed door next to the shrine.
Now that both Cyan and Zantis have receive the spear, return to Stahl and speak with Glaive to complete the quest. As a reward, you’ll receive Good Fortune Jewel IV and Multi-Medicine II.