Mewn cwm tawel yng nghanol Parc Cenedlaethol Eryri, roedd disgyblion Ysgol Dyffryn mewn trip maes i Dŷrgel Fawr, teml guddiedig sy'n swatio rhwng y coed tal a phlygan gleision.

In a quiet valley in the middle of Parc Cenedlaethol Eryri (Snowdonia National Park), the students of Ysgol Dyffryn were on a field trip to Tŷrgel Fawr, a hidden temple nestled between the tall trees and green folds.

Roedd y gwanwyn yn blodau'n fywiog, a'r awyr yn glir ar Galan Mai.

The spring was vibrant with blooms, and the sky was clear on May Day.

Gwyn, yn edrych ar gannoedd o flynyddoedd o hanes o'i flaen, roedd ei galon yn llawn cyffro.

Gwyn, staring at hundreds of years of history before him, felt his heart full of excitement.

Roedd chwedl am eitem hynafol o fewn waliau'r teml wedi cipio ei ddychymyg.

The legend of an ancient item within the temple's walls had captured his imagination.

Roedd am ddarganfod rhywbeth arbennig i brofi ei hun i'r dosbarth.

He wanted to discover something special to prove himself to the class.

Wrth i'r grŵp ddod i stop i ginio, edrychodd Gwyn o gwmpas.

As the group stopped for lunch, Gwyn looked around.

"Ymddihaenais," meddai, gan lithro i ffwrdd o gwmni'r eraill.

"Excuse me," he said, slipping away from the others.

Yn cerdded yn gyflym, aeth i mewn i lwybr newydd.

Walking quickly, he ventured onto a new path.

Ond nid oedd Gwyn ar ei ben ei hun.

But Gwyn was not alone.

Roedd Carys wedi sylwi.

Carys had noticed.

Cafodd hi bob amser ymdeimlad cryf o'r byd naturiol a'r effaith y gallai dyn wneud.

She always had a strong sense of the natural world and the impact humans could have.

Llygaid gydag amheuaeth, ei chanlynodd ef yn dawel i'r man dirgel hwnnw.

With eyes full of doubt, she quietly followed him to the secret place.

Esblygwyd y teml i fod yn ddrysfa o gamfeydd a briciau llwydion.

The temple had evolved into a maze of archways and gray bricks.

Gwnaeth Gwyn ei orau i gofio'r ffordd.

Gwyn did his best to remember the way.

Ond pob cam yn dod â shadow newydd wrth ei law, a byddai'r ofn doddi i gymylau o feddyliau o golled.

But every step brought a new shadow at his hand, and fear would dissolve into clouds of thoughts of being lost.

Yn y diwedd, cyrhaeddon nhw galon dynodedig y deml.

Finally, they reached the designated heart of the temple.

Yma, roedd carreg enfawr - yr hyn a dywedwyd ei fod yn llawn egni hynafol.

Here was a massive stone - said to be full of ancient energy.

Roedd golau prin ond roedd y carreg yn siglo â pŵer unigryw.

There was scarce light, but the stone shimmered with unique power.

"Be' wyt ti'n gwneud?" sibrydodd Carys.

"What are you doing?" whispered Carys.

Roedd ei llais yn boenus, ond hefyd yn lawn gofal.

Her voice was pained, yet full of care.

"Rhaid i mi ddarganfod," atebodd Gwyn, llais yn dirgrynu.

"I have to find out," replied Gwyn, his voice trembling.

Ond wrth ddal y llygad dyfaisyth Carys, teimlodd newid yn ei feddwl.

But as he held Carys' intense gaze, he felt a change in his mind.

"Be' ti'n feddwl?" gofynnodd o'r diwedd.

"What do you think?" he asked at last.

Ar ôl moment, gwelodd nhw gynnwys cyfrinach eu calon - rhywbeth oedd ddim i ond i'w rannu, rhywbeth yn syml ond yn bwysig; symbol oedd cardod a'n cydweithrediad.

After a moment, they saw the secret of their heart - something meant to be shared, something simple but important; a symbol of generosity and cooperation.

Wrth iddynt agor boced fach guddiedig, dim ond tegan tremorol a ddarganfyddasant.

When they opened a small hidden pocket, they discovered only a trembling toy.

Ond roedd y tegan marw'n disgyn i ddwylo Gwyn a Carys gyda gwen.

But the lifeless toy fell into Gwyn and Carys' hands with a smile.

Roedd yn trysor o amseroedd hir, testun llen gyda hanes cyfeillgarwch ac undeb.

It was a treasure from times long past, a subject laden with the history of friendship and unity.

Yn y funud honno, dysgodd Gwyn y gwerth o gydweithio a'r pwysigrwydd o barchu safbwyntiau eraill.

In that moment, Gwyn learned the value of collaboration and the importance of respecting others' viewpoints.

Tebyg, daeth Carys i ddeall ei bod yn gallu gwneud gwahaniaeth pan oedd hynny'n bwysig.

Similarly, Carys came to understand that she could make a difference when it mattered.

Gan adael y teml, roedden nhw'n gwybod, ymhlith yr wybren prin a chlychau'r Eryri, bod rhywbeth mwy yma nag arteffactau - roedd ffrindiau.

Leaving the temple, they knew, among the thin sky and the bells of Eryri, that there was something more here than artifacts - there were friends.

Mae natur yn agor pob trysor i'r rhai sy'n trin gydag ofal a'n parch.

Nature opens every treasure to those who handle it with care and respect.