Holy Sword Endu, Wind Gem locations and Akunra

Endu has five Wind Gem sockets and one Storm Gem socket, and starts with one Wind Gem fitted. Each Wind Gem adds one Wind Dash in the air; the dash works even when Endu is not your equipped weapon. The broken west bridge needs two dashes and the large pit in Obmuer Temple needs three.

Wind Gem locations

Gem	Where	Opens
1	Fitted when you take Endu from the Shrine of Endu	Short gaps on the Isle of Neasied
2	Raised platform above the first Crystal Monument; climb the hillside from the monument	The broken west bridge to Obmuer Temple
3	Obmuer Temple, lower passage from the large pit near the second Crystal Monument, through a wall opening where skeletons ambush you	The three-dash pit in the temple
4	Deimpo Mausoleum, above a pedestal between carved columns on the raised moving-pillar route	Longer Mausoleum and Ancient World gaps
5	Ancient World, a hidden cliff shrine guarded by Manticores; take the looping teleporter and the elevator	Feel the Wind achievement

Feel the Wind, for all five, is held by 22.2% of Steam players.

Storm Gem

The Storm Gem is at the top of the large staircase in the Tower of Knowledge, in Knowledge Keeper Wourha’s study. To reach it you need Endu, at least two Wind Dashes and the Azure Torch to light numbered statues 3 and 7; lighting the wrong statues spawns Book Bugs. Taking it unlocks Raging Tempest.

The gem adds a charged storm attack with its own meter beside the dash icons. It adds no dash and opens no doors. Patch notes call the move the Holy Storm Ultra Attack, and 1.01.06 fixed some weapons interrupting its animation.

Soul Bound Endu

At weapon level 10 Endu evolves into Soul Bound Endu and restarts at level 1. Its Power rises from 10 to 13, and forceful swings release a holy energy arc. Gems stay fitted. Levels come from hits, so use Endu on easy enemies from the start; see weapon upgrades.

True Holy Sword Akunra

Akunra has 17 Power and is required for Ending 2. Guides list these steps:

1. Raise Holy Sword Endu to level 10, then Soul Bound Endu to level 10.
2. Fit all five Wind Gems and the Storm Gem.
3. Recover Unok’s Remains in Deimpo Mausoleum after Poenir and Duenir; Unok was Endu’s sister sword.
4. Break all eight Sipeha seals with the Mask of Second Sight and Sipeha’s Lens.
5. Defeat Usunha and Wujomiod behind the eight-torch door at the Temple of Puwema.
6. Use the Altar of Purification behind them.

Not every guide lists step 2 or step 3, but doing all six covers both versions. Forging the sword unlocks Blade Bathed in Holy Light (9.6% of players). Akunra also opens a second entrance to the hidden altar for Okbujo’s Judgement.